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.
Base Breaker: A fairly minor one, but the revelation that Mr. Buu created a wife named Buuby and went on to have kids with her by shooting her with a "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 GT.
All Human players actually being saiyan hybrids descended from Goku or Vegeta is also one.
Surprisingly Improved Sequel: Several plot elements are considered to be a better then the 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 whatever that was at the end of GT.