My battery has actually gotten a bit better. I am a medium use kind of guy, I don't play games, but I do use it for work, phone calls, FB and Google+ (with a bit of web surfing thrown in. I upgraded last week as soon as iron posted this, and haven't done a full reset. I did wipe the partition cache.
If you stream, use bluetooth, game and have long screen on time you WILL suck your battery dry in no time. This is the nature of these. 2-3 hours though? "Inconceivable!" Yes - please post a screenshot of your battery usage near the end of those 3 hours so we can see what's happening.