If you're looking for something very simple to play (or you're just interested in Supers RPGs in general), I would suggest looking at Super-Action Roleplay by Four Color Studios. The writer (Scott Pyle) has done a lot of different skirmish games in the supers genre (as well as working on the...
I thought they did a good job of keeping the important pieces of the book, and the actor they have for Mr. Teatime (and his laugh) was incredible. There's some hammy acting, but all in all the cast was great and the movie is well worth watching if you're a Pratchett fan.