Dragonball Z Games
Dragonball GT Final Bout
Platform: Sony Playstation
Graphics: 8 (Japanese and American)
Sound: 9 (Japanese) 5 (American)
Gameplay: 8 (Japanese) 7 (American)
Overall: 9 (Japanese) 8 (American)

The first traditional Dragonball fighting game with polygons! Choose many Dragonball Z/ Dragonball GT characters, unlocking many more such as Vegito along the way. Boost up your character in the build up mode. Tournament mode and Multiplayer mode also. Each character has his/her own unique attacks, and are better at certain things (kicks, punches, ki.) Super Saiyan Goku 4 is the hidden character, and the last boss is Great Monkey Bebi.  I suggest buying the Japanese version because the sounds in the American version are simply terrible. You do need a mod-chip or a VGS for pc to play Japanese or other language games.  
Dragonball Z Legends
Platform: Sony Playstation
Graphics: 4
Sound: 5
Gameplay: 8
Overall: 7

O.k so the graphics look like SNES, but this game is fun! You get to select many characters, especially in multiplayer mode. The saga is from Nappa-Kid Buu! This game is only available Japanese, so you won't be able to read the plot, but if you are a crazy DBZ fan, you'll know what's happening.

Ultimate Battle 22
Platform: Sony Playstation
Graphics: 5
Sound: 6
Gameplay: 7
Overall: 7

This 2-D fighting game should really be called Ultimate Battle 27, since you could unlock 5 more characters. Ultimate Battle 22, you can choose 27 characters (unlock 5) and put them in combat!
Personally, I don't quite like this game all that much.

Platform: PC
Graphics: 8
Sound: 8
Gameplay: 8
Overall: 9

This is a great game! Battle in 3-D Quake style! In order to play however, you must have "Quake 3 Arena" on your computer. It used to be just a DBZ game, but now there are other cool animated characters in it! When you power reaches 1,000,000, you transform! Each attack takes away your ki, so make sure to power up from time to time. As your power increases, you get new attacks, and of course you get stronger. You can also teleport. The only way you could play is over the internet, or create your own game.