I hated Tokusou Sentai Dekaranger when it was first airing. It was set up as a serious Cop Show (IN SPACE!!) with some interesting concepts, but the sheer idiocy of most of the characters completely wasted the concept, and the majority of the cast couldn't act to save their lives. Particularly galling was that the head writer, Naruhisa Arakawa, had written some pretty damngood stuff in the past. In my mind, it was a disgrace to Super Sentai. Then, years later, it finally clicked. Dekaranger was an Affectionate Parody disguised as a serious show. The characters' idiocy? That was Arakawa dialing all the usual Cop Show tropes up to 11; for example, the sheer petulance of Ban and Hoji's rivalry was one giant parody of a Buddy Cop Show's Odd Couple. And, ultimately, what made me really start to like it was when I realized that the entire show was, more than a parody, one long love letter to pop culture. Arakawa packed the show full of Shout Outs to every single show, movie, actor, genre, and author he could think of. Now, I still don't like most of the cast (indeed, the cast was the main reason I failed to "get" Dekaranger when it was first airing), but from a writing perspective, Dekaranger is pretty damn good. — Tokuiten
I always loved the series, especially how they kept the main villain as a periphery and focusing more on the Monster of the Week instead of going with the old cliche of having a villain try to take over the world (don't even start, Raul Julia...) It makes sense if you keep in mind that Aburera is supposed to be a black market agent, and thus would get involved with other criminals only to the point of making impersonal deals and exchanging goods/services with them, so keeping him out of the limelight and putting more focus on the Monster of the Week would fit in perfectly with the series' status as a Super Sentai crime drama - they're working on a case-by-case basis, and can't afford to focus on a single villain when they have other criminals they had to capture. What bugged me, though, was the last-minute Ass Pull that he had planned the destruction of the S.P.D. from the beginning in order to create a criminal paradise, which didn't seem to fit well with his personality; he's not the sort to get his hands dirty or to bother with fighting the law directly when he does his best work in the shadows. However, looking at his words, his actions, and his role in the series, things actually start making sense: he's a black market dealer, it's in his best interest to avoid police confrontation, whenever possible. Not like the forensic evidence found in the scene of his clients' crimes would nail him (it would be like arresting a pawn shop owner for buying/selling a gun that was used in a murder; you could try, but how would you prove that he knew what the gun was going to be used for?), but still, better to be safe than sorry. His gathering of information from the beginning would be more along the lines of sizing up the local law enforcement before setting up shop, using the information he gathered to find weaknesses in the force, blind spots in their jurisdiction, crooked cops that could be paid off, etc. Note that he doesn't even use what he learned against the S.P.D. until much later in the series, after they've proven themselves an obstructive thorn in his side by interfering with his clients' crimes and, thus, ruining his deals with said clients. He starts out indirectly, using hired thugs and using his brainwashing bats to take out and/or discredit the S.P.D. for him, before moving on with direct assaults when those failed. The brutality of his final attack on the S.P.D., as well as his rant about creating a criminal paradise, cements the deal: he didn't plan on destroying the S.P.D. from the beginning, he was pushed into it as a final solution to keep his criminal empire afloat. In short, the final episodes of the series was one massive Villainous Breakdown by Aburera, and his rant about building a criminal paradise wasn't about what he was going to do, but what he already had with his black market, and what the S.P.D. ruined by their interference.
Why is Umeko always claiming to be the leader, even when it's clear no one acknowledge her as such? Simple, she was being recruited as Gyoku Routhe former Deka Redwas being wounded and forced to leave SPD. As a result, Doggy must have warned her about the other members being distraught over losing their former leader, and Umeko must have (mis)understood this as meaning that she was going to be their new leader.
In the first episode, Umeko sings the same song Remi Hoshikawa sang to her kindergarden class in Chikyuu Sentai Fiveman. Mika Kikuchi, Umeko's actress, was 20-21 during Dekaranger and 6-7 during Fiveman. If Umeko is close to the same age as Mika, then Umeko could've plausibly have been a student of Remi, in essence Deka Pink was taught by Five Yellow.
Hoji was able to kill Teresa (his lover)'s brother for taking other girls' lives to transfer to his sick sister, and Vino (his old friend) for willingly becoming a mass murderer for money. However, he couldn't bring himself to kill Ban when the latter's body was hijacked by an Alienizer who planned to destroy the world by using Ban's body, even when he literally begged Hoji to do so. At first, I only thought of this as Hoji caring about Ban so much he couldn't do so, but then I realized it's not only that. Hoji could only kill a loved one if they actively and willingly committed bad things. The two times he killed humans were all because they knew what they were doing was bad, but still did so regardless of the consequences. However, Ban's body was taken completely against his will. The Alienizer used his body to guilt-trip the others despite Ban clearly trying to resist it, even asking them to kill him. That was exactly why Hoji couldn't kill Ban - because he couldn't bring himself to kill someone who was being used against his wish. (But it's also because he likes Ban.)
Many of the Alienizers are fairly simple in design for Super Sentai monsters, some of them little more than a mask and unitard. Why? Because in this series, there's not only a monster-of-the-week, but often a mecha-of-the-week, stretching the costume budge thin.
So, in ranger mode, where DOES Doggie fit that snout of his?
Ban actually asks him this question in the fact video that plays before the credits in episode 14. His response? "Don't ask that." Then he scratches his head in confusion. Apparently, even he doesn't know how that's possible.
In the Dekaranger vs. Abaranger special, Umeko gets a blade slashed across her torso and sparks fly (as usual). The problem is, she suffers neither physical nor Clothing Damage, and she's unmorphed at the time.
The blast from the Deka Wing Robolooks like it could level a few blocks. Who would authorize the use of such a weapon? Kruger? Maybe his authority is that high (he's head of Earth Branch, right?), but then again, being a noble warrior, would he choose to employ such a dangerous weapon within the city limits unless the battle was truly apocalyptic? (Granted, Kruger does pull the trigger via his Megazord, so it is on him in the end, but...)
Addendum: Why doesn't the resulting blast level five square blocks?
For Dekawing Robo, it's because it always takes its enemies into the upper atmosphere before they transform it, and for Dekabase Robo...I guess he's extremely careful with it.