Killer Instinct
Seeing that shyt in the pizzeria near my house when I was a kid was
There was no graphics even close when that game came out
Edit - Also, the original Donkey Kong Country for SNES. Another Rare game that blew my mind with the graphics except that was on a home console, not in the arcade. I was like 'how the fukk does an SNES game look like this?'
That 90's Rare team was so insanely talented. Damn near everything they dropped was straight flames and they really tried to push every platform as far as it could go. They even got a fully voice acted game (Conker) onto a N64 cartridge. Nobody thought that could be done