Capcom Gundam fighting game goodness
You're talking about those Gundam Vs Gundam games, not Gundam Battle Assault, right? I loved the Gundam Battle Assault games, but they're probably kinda bad in retrospect lol.
Most of the PS2 Gundam games are pretty solid adaptations. I remember Robotech: Battlecry from the same era being pretty neat (and had a nice cell-shaded style, too).
I like some of the Sailor Moon beat-em-ups (Sailor Moon R on the SNES and Sailor Moon on the Genesis come to mind) and some of the Macross shooters. The Magic Knight Rayearth JRPG was something I have fond memories of, but I haven't played it in 10-15+ years.
The Cowboy Bebop game for PSX is a kinda disappointing rail shooter.
Stuff I've been meaning to try, but haven't had the patience to play (since they're in Japanese with no English patch that I know of): a bunch of Votoms games, the Gunbuster PS2 game, Gihren's Greed, the Utena game on Sega Saturn.