These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complete Monster: As early as 10 episodes in, Enter gleefully entered this position. Starting from his 'attempts' to appease his MajestyMessiah, which involves causing misery as much as he likes and pulling Unwilling Roboticisation, even on children, using them as human shields in much more frequently than Guirail could even muster and, on top of that, having a blast while doing them with an unabashedly relaxed, but still nasty speech pattern peppered with Frenchphrases. He's like a Basco that has been around ever since the first episode. Even after Messiah is apparently destroyed, he seems to escalate his horrors, going so far as to implant himself with two cards containing backups of Messiah's data—one of which also contains Masato Jin's data — in order to become the new Messiah, as well as implant Hiromu with another card to serve as his Soul Jar, forcing the Go-Busters to face the possibility of killing Hiromu in order to stop Messiah once and for all. He even threatens to harm Hiromu so grievously as to put him into a coma, just so that he can keep his Soul Jar alive without worrying about Hiromu attempting to off himself — assuming the card would let him do so.
Ensemble Darkhorse: Enter has proven to be quite popular amongst fans, who like him not only because of his enjoyment of being the bad guy, but also due to being a quite credible threat, being able to go toe-to-toe with the Go-Busters in fights and succeeding in several of his missions. His proving to be very Dangerously Genre Savvy and learning for his mistakes as the show moves on has made fans like him even more.
Among the heroes, the most popular character is, oddly, Usada.
Now we have Beet Buster and Stag Buster. Their hilarious antics and awesome design and fighting style really help.
Since the 'exporting' of Super Sentai internationally under the name Power Rangers is old news by now in Japan, the whole premise of Rangers protecting their world's power supply (the whole Enetron shebang) may have been Toei's attempt to create literal Power Rangers.
One old rumor before Go-Busters aired was that Gavan would be the teams mentor. Thirty episodes later, guess who appears? Well...Mind you, not the one we were thinking of.
In #33, the Powered Custom Super Mode involves an addon to the morpher that fuses our heroes bodily with their Buddyroid partners...kinda like CycloneJokerXtreme. As if reinforcing this, Red sticks to close-quarter combat (like CycloneJoker), Blue summons a girder that he uses like a staff (HeatMetal), and Yellow sticks with the shooting (LunaTrigger)!
Ryuji was not the first blue ranger to have problems with Overheating. Gosei Blue had in one episode too and, while Ryuji gets psychotical, Hyde gets HILARIOUS.
Ho Yay: With Shelly and Yōko in episode 31 splitting desserts.
And in Mission 49, he goes even further, assimilating an Enetron tank, turning it into a Megazord, along with dozens of innocent employees. He even attempted to absorb children! And his final plan has him doing this all over the world. As if we needed any more reason for him to be deleted!
Enter after his defeat in Mission 30. Somehow him becoming more stoic and calm with only occasional traces of his troll-like persona remaining. Somehow this makes him even more disturbing than he already was.
Well, Escape's megazord debut. She takes Enter and CRUSHES him using the megazord's hands. It's pretty graphical for a show like this and there's the crushing sound to make everything better.
Robo Ship: Usada and Yoko. Later, Yoko and J get paired up often.
Episode 30. After spending 13 years and all the series trying to save their families, the episode has our heroes forced to sacrifice their loved ones to foil the Big Bad. Made even worse when the team leave hyperspace, and each of the original trio try to deal with their pain in a different way.
Episode 50. Jin pulls a Heroic Sacrifice to destroy Card no. 13, freeing Hiromu and ending Enter's immortality. His speech beforehand, the reactions of the heroes to his plan and his and Hiromu's father's data remnants telling them to return home after Enter's defeat only adds to it all. So long, Beet Buster...
In Go-Busters vs. Gokaiger, the Buddyloids have to use some of their own Enetron to transport everyone back to the present from where they were trapped in the past. This, combined with taking damage during the transport, causes damage to their programs, and when they're finally repaired they no longer have their personalities. The Busters don't take it well. And then later they actually have to go into battle with Go-Buster Oh this way.
Notable is the almost complete lack of stock footage, especially when the previous season was full of it.
Tough Act to Follow: Go-Busters is a great show, but had the misfortune of coming after Gokaiger, which was brimming with awesome. It's worse if you compare it to Kobayashi's previous Sentai, Shinkenger, where the cup runneth over with epic dramatic awesome every single episode.
Uncanny Valley: An intentional case. Hiromu's face on Enter's head is very...off.