Take a deep breath. Count to ten. Ignore posts that you don't like.
There hasn't been a wide-scale battery porblem reported on the iPad - the big issue has been on the iPhone. There are occasional cases (yours might be one), but there's also been and awful lot of emotion around battery life.
Down the years, I've seen complainst about battery life after evyer single iOS update, and I've had iPhone and iPad since they came out. Most (not all) of the time, it's been people, dare I say it, obsessing a bit. That's probably why igmackenzie's pushing for a more "relaxed" approach.
My view is that 15% an hour is abnormally high. A restore will remove the possibility that it's a holdover issues. The discharge/recharge will eliminat the battery counter. If they don't work, there will be 3 possibilities ;left:
1. You have a hardware fault
2. You have a rougu app that you use a lot and taht has an issue with iOS5 (there are quite a few of these)
3. You are worrying over nothing.
After the restore/recharge, if the issue persists, we can look at these possibilities.