Do you actually use your phone? Every person I know that own S2s say they're daily chargers as well.
It depends on the user, battery life will greatly vary depending on the user, some people keep the internet off most of the day or play less games or what ever their preferences are.
Especially once you start getting lots more charge cycles and are slightly less infatuated with your device, your battery will start lasting much longer, my Transformer can last between 1 - 2 weeks which isn't bad.
Sent from my ASUS Transformer, rooted with Revolver ROM, 1.6GHz