-Garlic Jr: Great backstory for Kami and Lookout in general. Too bad it was badly written and full of plot/PL inconsistencies.
-Wheelo: Bad imitation of Dr Gero story.
-Turles: Badly written generic Saiyan villain.
-Lord Slug: Badly written generic Namek villain.
-Coola: More family members from Freeza's family. As if a father (Cold) coming out of nowhere in canon wasn't bad enough.
-Super 13: Flat story, obvious attempt to further milk SSJs/Androids. What I like about it is the theory that he can perfectly fit in canon if we assume this story happened in Unseen Timeline (only Trunks comes from the future). It feels like we at last see something from that timeline that was left totally in the dark in canon.
-Broly: Awesome villain, great story with only a few minor PL inconsistencies (which can be explained with some effort). Perhaps they should have waited to do it after Cell Games so that it would be integrated into canon in a more plausible way.
-Bojack: Great groups of villains with unique transformation and abilities. Ending it in the same way as Cell Games, though, was a little anti climatic.
-Janemba: Bad imitation of Buu.
-Hirudegarn: Nothing is special about this villain. PL inconsistencies suck ass. That story would be better for a Zelda game.