Our son turned 18 months on January 2, 2013. Took him 2 weeks, but he can turn it on, choose his profile, and choose apps. Needs some help with getting to the second screen where the two phonics apps are, but he really likes both of those videos. I think you're son will do fine after you show him. Good luck!
Not really. There is a drawing/coloring app/game, but that will be the only thing really aside from the videos or maybe the alphabet flashcards. My 3 1/2 year old is just getting able to really work it.
I would probably wait at least another year or two. My son is almost 4 and he is just now getting to where he can play games by himself without getting mad nor frustrated and constantly asking for my help.