Well for me its almost the same with 2-3 hours of wifi and 1 hour of robo defense... and 3-4 hours of talking...
Other wise with around 2-3 hours of talking and 30 minutes of robo defense it last for about 48 -52 hours....
and with very very moderate use (like 2-3 hours of intermittent talking) makes it last for around 2-3 days...
Also it'll be better if you use a good task manager and close all idle apps after 10-15 hours.....
Do try and cycle the battery once or twice...might help..
IMO its the wifi which drains battery like anything (also check if GPs is on or off)
I was also worried in the beginning but after i started using it like just another phone .... battery life was pretty good!