I don't mind the Infinifilm so long as you watch it once without the features and then again with it. You should treat it as the same as director's commentary. In some cases, it's nice that you get to know at exactly what point in a movie the director or stars are referring to with some added note or bonus feature. Better reference point that way.

I've got three Infinifilms: Goldmember, Elf, and Blow. I've watched some of the Infinifilm features on Blow and that's about it. Just didn't have the time to wrap it up.