I liked the first movie the best. In the TV series, everyone was in perfect harmony, but at least Raph had some issues. And I liked Donatello's name-fight with Casey when they're building the truck. That was funny. And the Shredder was so much more of a bad-ass than in the TV series.
The second movie was alright, but it coulda been done without Vanilla Ice. I did think the costumes looked a lot better than the ones in the first movie. Tokha and Razar where nice additions and were actually pretty cool. Although Don got to show more smarts, he was never the genius he was in the cartoons. The movie Don never made an interdimensional gateway out of a toaster.
The third movie was crap, although there were some good moments. The cotumes were just pitiful. Sure, they were pretty small and skinny compared to the previous two versions, but the Turtles are supposed to be bulky. Overall the film was a little too hokey for me.
[edit] Also, "Turtle Power" by M.C. Hammer is much better than Vanilla Ice's "Ninja Rap"[/edit]
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Teenage Mutant Ninja Spub!