You either have it calibrated wrong or bought a lower tier Viera. My VT60 heat output is almost non existent, my older 50 inch Sammy puts out heat like an oven. Every friend of mine who has seen my TV have said is the best or one of the best looking TV's, some are LED owners themselves as well.I read alot of reviews before I bought my TV and I went with a Panasonic Plasma Viera. It's not a bad TV but My friend's Vizio LED is much better. I have the TV calibration setting modeled off of some forum so its the best it can be and it still isn't as good as an LED imo. Next TV I get will be an LED. Not to mention, my plasma puts off quite a bit of heat and in a bedroom, you can tell when it has been on for a while.
I don't mess with the calibration, I leave it on THX-Bright. Looks perfect IMO.