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Nope, been better than Lion performance and heat wise for me. Might be worth trying a SMC reset.

Good idea, I'll give it a try.

This has been a huge issue on my mid-2010 MBP and others have reported the same on Apple forums. My MBP has been overheating, throwing up artifacts all over the screen and freezing requiring a hard reboot. So far so good though... fingers crossed.

Also have a mid-2010 that I use mostly for design.

Definitely noticed the artifacts at 10.8 - haven't seen any during work today after updating to 10.8.1 though FC

Yes! I definitely noticed the back, left area on the bottom was hotter than I ever remember it.