Eck, I hated Gauntlet Legends, fights just boiled down to a complete mess of button mashing and ugly graphics with a very limited movement arc. (I liked the old 2D Gauntlet).
Good to see more encouraging stuff on Under Defeat though I can't really afford the prices it's gong for right now, £60 here in the UK so that's over a $100 US. Just to say to the previous poster obviously not having played Under Defeat I can't compare the two but Zero Gunner 2 is an absolute must own. It is the best shooter I have ever played, and I have played a lot.