1. My favorite would have to be Ogres. I remember seeing my 1st Ogre and watching him take out half our party in one set of swings. It was really awe inspiring and fighting Ogres on low level un-twinked characters can be very challenging. I have basically liked them since I fought my first one because of the challenge at the time.
2. I generally play between 2-6 hours a day.
3. Getting past Jacoby(My first character was a Rogue). In all actuality the most difficult thing was getting the combat system down, learning where to place myself and adjusting to the flow of a fluid and highly mobile combat system.