What game(s) with little to no replay value can you/do you play time and again?

DS and GBA.

I haven't finished a whole lot of DS or GBA games, but I keep coming back to Gunstar Super Heroes.

Hmm. Well, many people think that Phoenix Wright doesn't have much in terms of replay value, but I've played through it three times and every time it's a ton of fun.

What else?...Well, I do enjoy some Yoshi Touch & Go here and there; it's not that it has no replay value, since you can always get a higher score, but most people couldn't get past the 'demo' feel and ignored it. It still remains one of my fav. DS games, though :)

Fire Emblem 7, and Fire Emblem Sacred Stones. They never get old

Oh and Pokemon Pearl, although some would argue replay value, its just the same quest over again. whatev.