Overall, the tablet is quite good. I was able to play Fleet Operations, PES 2014 (1027x768 Low) and old capcom games using emulator. Have yet to test Crysis, but I think it wont be enjoyable.
On battery life, I doubt 11 hours is reachable, but probably for just surfing the internet and not streaming any videos.
7-9 hours are probably more reasonable for a good mix of work involved.
This is a tablet with an atom processor folks. You need to be realistic in terms of your expectations. Movies, editing docs, reading, some low res gaming is ok with it.