My first DE game was Batman. I played it for hours and hours and then sold it in 2002. Three weeks ago, on the Dutch Pinball Open, I got to play it again and still loved it!
But there are many Data East games that I like. Rocky and Bullwinkle stands out because it's just so much fun to play. But I also love my Gn'R, great ruleset and obviously great music. The nicest theme is Tommy, in my opinion. What a great total package and I like how they didn't over-use the blinders - keeps them special. and what about Apollo 13. The rocket, the moon, the 13 ball multi-ball. The only thing that sucks about that game is the backglass. TFTC is also a nice game with a crazy theme and even crazier artwork. Jurassic Park - fantastic license and a ball-eating Dino! And what about Last Action Hero. Definately a fun game if you can find one that functions well.
I'm by no means a DE fanboy, but do think that many of their games are equally good as Bally/Williams games from the early nineties. Okay, maybe the gameplay is not as good, but they did have some creative designs and nice artwork on some of their games. Any collection should have at least one or two Data East games, if you ask me.