2K1, easy decision for me.
It looked awful and sounded awful. I remember playing it for the first time and being absolutely gobsmacked at how bad the presentation was. The shitty character portraits, the drab and lifeless backgrounds, the weirdly designed UI, the super shitty music that felt like cut songs from a bad 1989 R&B album...even the character voices sounded much scratchier and poorer quality.
All that said, the roster was still great, the gameplay was very solid and fun, the intro was neat, and the two final bosses were badass.
So, even though it's the worst, it's still a fun game even if it often makes my eyes and ears bleed.