Originally Posted by Maylander 
I actually prefer mid-to-high levels, mainly due to casters. I simply can't stand low level mages/sorcerers.
Same here. And how well high levels are done depends on how the enemies are done and what the general difficulty is. For example, in MoTB playing as a wizard or sorcerer is very difficult despite very high levels. In HoTU it's a piece of cake.
I couldn't even finish two optional fights in MoTB, the one in the Ice Lodge and the one in a random cave with a regenerating jaguar. High levels didn't exactly help.