i likes skills, skills, and more skills!
well maybe not that many skills... but i agree with PZep on this one. i really did have a lot of fun playing WoW, and a good amount of that fun was playing around with all my fun skills
now clearly we all know there must be a balance, and all the skills we get should be rather useful. every class will have a few skills that are only good in a certain situation, and are rarely used, but could be a lifesaver if used at the right time. a good mix of useful skills makes the game more fun because it's more than just "watch toon hit monster, use skill... wait for cooldown... use same skill". you get to initiate combat then "use skill, use skill, trigger a another skill use it, evaluate situation, use another skill". seems more action packed for me