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.
YMMV: Dragon Ball GT
Archive Panic: Combined with the other two shows, there's 508 episodes. Each episode being about 20 minutes long, that's 170 hours of content.
Critical Research Failure: In the last Dragon Ball arc Gohan obtained a new state that surpassed his Super Saiyan forms. In GT, he still uses Super Saiyan. This issue has been acknowledged in trailers for the latest Z movie that had to be modified to remove Gohan's Super Saiyan form.
Crowning Moment of Awesome: Goku going Golden Oozaru Super Saiyan once he finally manages to grow his tail back, and has a rematch with Baby possessed Vegeta.
The Golden Ape transformation alone totally makes up for GT's existance.
When Goku comes out of the crater holding a spirit bomb.
Goku and Krillin's conversation in the last episode, even more of a Heartwarming moment with the Japanese music.
Baby Vegeta making Baby Bulma his queen, in it's own creepy way...
Ensemble Darkhorse: Nuova Shenron. Fan demand even got him added to Budokai Tenkaichi 3 (his alternate outfit uses the colour scheme of his brother, Eis).
Omega Shenron as well. Go look up silly, out-of-context GT video clips on YouTube. A good chunk of them involve Omega Shenron in some way shape or form. Not to mention his frequent inclusion in video games, even ones that otherwise exclude GT characters.
Hilarious in Hindsight: In the episode where Earth is evacuated Goten talks with deliquent voiced by Chris Sabat. Funimation was referencing YuYu Hakusho with both characters being voiced by YuYu Hakusho actors.
In the English dubs from Z, they made up a line in which Vegeta joked that he got stronger by doing push ups and drinking milk or juice. In the Blue Water dub of GT, Goku claims the reason for his strength is doing several push ups so now we know the difference between the two fighters.
Just Here for SSJ4: Years after the series has ended, the most iconic element of the series to really stick out for the franchise as a whole was the Super Saiyan 4 form.
Especially with all the hypothetical fan art on further evolutions based on this idea, it helps that the "Super Saiyan God" form is essentially much less impressive to look at
Memetic Badass: The fact that an elderly Krillin was able to land a hit on Goku during their friendly fight at the end of GT (Goku was obviously not fighting at full power) has prompted a meme that Old Man Krillin is the biggest Badass ever who could defeat anyone with ease.
Moral Event Horizon: Baby attacking his own mind controlled citizens and trying to destroy the Earth simply because he knows it'd hurt Goku.
No Such Thing as Bad Publicity: In a meta-sense, it was used deliberately by FUNimation when marketing the series in North America. At first, they started their releases with the 17th episode and made their own recap of the first 16 ("A Grand Problem"), ostensibly to jump straight into the more action-oriented part of the series. The heat they took from the fanboys was intense. Once the first 16 episodes were being put out as "Lost Episodes", however, the goal they'd had all along became apparent: to generate demand for the less-appreciated earlier episodes through fan outrage. Mission accomplished.
Recycled Script: The Super 17 saga and the villains escaping from hell was literally a retake on the Dragon Ball Z movie Fusion Reborn.
Let's not even mention the end of the fight against the Final Boss, which is a complete retake of the end of the Majin Buu fight in Z.
The story of Zoonama, a minor villain from episodes 7 and 8, is a repeat of Oolong's origin story from the original Dragon Ball with the sole exception that, unlike Oolong, Zoonama does not become a recurring character.
Scapegoat Creator: In an odd reversal, many detractors of the series point to Akira Toriyama's lack of involvement in the show's creative process. In reality, he was involved to a degree (he named the series, drew the logo, acted as a consultant for plot ideas, and designed the aged characters. So, yes, Toriyama was the one who gave Vegeta a flat-top and mustache), and going further than that, he's stated several times he's actually a big fan of the series. He even doodled a sketch of Super Saiyan 4 Goku on the side of his blurb for the GT Dragon Box. Think about that for a second: the creator of Dragon Ball drew fanart of someone else's transformation made for one of his characters.
They Wasted a Perfectly Good Plot: This series is full of this. There are lots of good ideas for epic story arcs, like the vengeance of the Tuffle race, the return of Android 17 as a villain manipulated by Dr. Gero, and fighting an evil version of Shenron, but very few of the ideas are executed well.
This was mostly due to the start of the show not getting the desired ratings when it started. It's obvious Toei was focusing more on keeping the money train rolling then telling the stories proper. By the time they started trying to get themselves together, their episode order was cut to only 64 episodes forcing them to condense the planned arcs the best they could.
And not a story arc, but they spent over a year on this series and never had Pan go Super Saiyan (at least not in an unambiguous way).
So Okay, It's Average: Now that the dust has mostly settled, most fans seem to view GT as having a few very good ideas that were poorly executed and overshadowed by some of the less savory decisions and designs. It's not a bad series but certainly could've been better written.