Data East Star Wars.
I know it's as shallow as a puddle, but it's a game I played to death back in the day and I have a soft spot for it even now.
Baywatch
Cheesy as all hell and definitely one that falls into the 'acceptable in the 90s' category. I just find it great fun and if the same machine had been given a more 'popular' theme, it would be on so many players' top ten lists.
Theatre of Magic.
A top 20 game, but one nobody seems to admit liking. Well I do! Great atmosphere, some neat ideas and one that I can play for ages. Another one on my grail list.