* AngstWhatAngst: The player's character lost his/her hometown at a young age and is forced to fight dangerous villains despite being a small child, yet he/she seems to be perfectly fine with his/her situation.
* AntiClimaxBoss: Android 9 from "Red Ribbon Army HQ Ruins Map". Despite being the final boss of what is possibly the most difficult map of the game (not counting dungeons for partys), he himself is only an Ultra that can be defeated by 2 to 3 players with relative ease, and the Most of his difficulty is due to his two bodyguards.
* BrokenBase:
** A fairly minor one, but the revelation that Mr. Buu [[spoiler:created a wife named Miss Buu and went on to have kids with her by using something called the "Love-Love Beam"]] is either hilarious or idiotic depending on who you ask.
** The game itself. Those who know about it debate its {{canon}} status as frequently as they do ''[[Anime/DragonBallGT GT]]''. Specific elements of contention include the prevalence of the Super Saiyan transformation, and New Namek and Yardrat's destruction. This has only been exasperated with the release of the ''[[VideoGame/DragonBallXenoverse Xenoverse]]'' [[VideoGame/DragonBallXenoverse2 games]], which uses the characters, setting, and plot points of Online but in a different context, muddying the waters further.
** All Human players actually being Saiyan hybrids descended from Goku or Vegeta is also one. Particularly for players who wanted to play as actual Humans without alien lineage or didn't want to be [[HeroicLineage descended from]] Goku or Vegeta (WordOfGod, however, has established that pure humans are still the weakest race, so the decision is justified somewhat).
* CharacterTiers: Namekian Shadow Knights, in particular, were considered one of the best PVP classes. Other High Tier classes were Swordsman and Dende Priest for PVE.
* DemonicSpiders: Super mobs that knock out, especially tigers, are even harder to beat when you have to fight several at the same time because you don't finish recovering from a knockout and get knocked out again.
* EnsembleDarkHorse: The Majin race was the best-received idea of the game, to the point they even made it into ''VideoGame/DragonBallHeroes''!
* GameBreaker: Turtle Hermits as per the level 70 cap. 10 second Area of Effect stunning? Check. Giant Kamehameha being the most damaging move in the game? Check. Self casts to boost your already insane damage and speed debuffs that slow your enemy to a crawl? Check and check. They are such an insane class, they are essentially a JackOfAllTrades in both PVE and PVP environments with their only real weakness being their low health pool. Even then, with your debuffs at your disposal, you can eradicate anything that poses a threat.
* GoddamnedBats:
** Normal Mobs with stuns. They are not difficult to kill but can ruin channeled attacks. They can turn into DemonicSpiders if you are unlucky enough to deal with several at the same time.
** Literal bats are usually this at low levels, even when they are not stronger than an average Mob, they usually patrol in a group of two, and some patrols often have paths that intersect, so there are cases where the player will have to fight against 4 at the same time, and if it is low on life can end up dying.
* SurprisinglyImprovedSequel: Several plot elements are considered to be better than their equivalents in ''Dragon Ball GT'' by fans. It helps that Goku and Vegeta presumably met their end in a blaze of glory befitting two Saiyan warriors rather than [[GainaxEnding whatever that was]] at the end of ''GT''.
* ThatOneLevel: The "Red Ribbon Army HQ Ruins Map" is an incredibly difficult area to pass. Not only are there many enemies, but these usually have powers such as paralyze or confuse, so being attacked by two at the same time can represent death. Finishing it on your own is practically impossible, so you will always need the help of other players.
* [[TheyWastedAPerfectlyGoodPlot They Wasted A Perfectly Good... Everything]]: The game was shut down before a lot of elements could have been expanded on. The Mechanic classes, Cell's clones and descendants, [[BigBad Mira]]'s plans, all those had merely passing mentions before the end. That's to say nothing of the character creation system, which after the shutdown left only the generally-loathed ''[[VideoGame/DragonBallZBudokaiTenkaichi Ultimate Tenkaichi]]'' as an option for those with {{Altitis}}.
** It seems that the people making ''VideoGame/DragonBallXenoverse'' are looking to subvert this, what with the superior character creation as well as the recycling of several characters and plot elements from Dragon Ball Online.
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