I don't think that's normal, although as someone mentioned, it could be because of a combination of configuration+network.
Anyway, in my case, I'm "happy" with the 4S battery's duration. Not completely happy, because on weekends I often have to charge the phone in the middle of the day to make sure that it lasts enough (It could be my fault though, sometimes I use it a lot...). During the weekdays that's no problem because I'm at work most part of the day and don't have that much free time.
Right now I have 68% of the battery, after 3:30 hours of usage and 14:21 of stand by. I've used mostly for music (maybe 1:30 hours), and then I played around with different services (twitter, mail, a short call, a little bit of gaming...).
I usually reach about 7 hours of usage on average, with the same kind of usage (well, I should add quite a lot of FaceTime usually). I have all of the services activated, except bluetooth. I use iCloud, Siri, location, 3G, wifi, wifi sync, push...24/7 on.
I even reached once 11:29 of usage. I was surprised myself, that's not normal at all. I guess I listened a lot of music with the iPhone on sleep mode.
I think that something's wrong there, definitely
