There are very few games with a skill system I like more than Gothic.

Elder Scrolls, now those are games with awful skill systems. I still remember equipping heavy armor and buying a lot of healing potions, then standing still with three mudcrabs pounding on me for an hour or two so I could level my heavy armor to max. Jumping continually to level acrobatics, sneaking around the island to level sneak skill, etc. Absolutely horrible, even though Morrowind was definitely not a bad game. People nag about grinding in MMO's, but they forget that a lot of single player games they idolize necessitate it, as well. I can't believe they didn't radically change that for Oblivion. Tsk, tsk.