Cooling is terrible on Macs - it's just one of those things. It hasn't really changed with the 2010 models. The best way to avoid overheating and the consequent stuttering/etc is to spin up the fans to max prior to doing anything strenuous, never use it lid-closed (even if you have an external monitor), and put it on a cooler or stand which allows for sufficient airflow under and around the machine. Putting airflow OVER the machine - across the keyboard - helps more than airflow under the machine, as would e.g. a 'traditional' underside-vented Windows notebook.
Many Appleist Dunning-Krugers make reference to aluminium being a good conductor of heat when talking about the unibody case, but the fact is that the MBP's casing no longer gets that hot, unlike the 2006-7 Macs which could easily reach 50C on certain areas of the case - and this is due to heat *not* being translated to the case. The Apples therefore rely on the fans quite a lot to move heat out of the system, and the fans don't work that well, all things considered , when compared with a performance Windows machine.
So helping it along with the above steps will allow your Mac to stay cooler.