I felt burned by the Saturn port of Mortal Kombat II. I remember asking a Babbages employee if it was arcade perfect and she responded "completely." It was a dripping mess, and to add insult to injury, the Ultimate Mortal Kombat III port was much better.

I've purchased MKII for several consoles over the years (Genesis, SNES, Saturn, 32X, Xbox, PS2, PSP) and still haven't received a 100% perfect version. I have yet to try the new compilation released a little while ago for 360 and PS3 and hope my search will finally end.