It really depends on what type of game I'm playing but I prefer utility classes since I like to have lots of tricks at my disposal so these would include rangers, mages, paladins, clerics, and bards. My least played? The melee glass cannons and I'm not talking about a rogue I'm talking about beserkers since they have no real utility outside of beating things senseless as fast as possible in hope that they won't be taken down quickly. At least with a rogue class you have a chance at killing an enemy outright and often have some tricks like setting traps and poisoning enemies.