No.  They are great time wasters for when you are waiting around to go somewhere, waiting for a friend, waiting to get somewhere... or any other micro-minute-waiting situations... or for on the crapper if you're that kind of person.  But really, mobile games have earned LESS interest from me than last year - especially after the disappointment that was Scribblenauts.  Yeah, that's right, I bought into their hype.  I knew better than to listen to a developer talk about their own game - but damn it, the IDEA of Scribblenauts was so awesome I couldn't help myself!