I have always enjoyed watching Rajon Rondo (athletic freak), Ray Allen (even though he is on the Heat, his shot is a beauty), Dirk (the most polished player I have ever seen, uses his tools to perfection), Parker (speedster and crafty), Paul Pierce (wily) and Ben Gordon (for his old flashes of pure scoring). This is definitely a weird list that is largely devoid of big men.
I have always strongly disliked watching Tim Duncan, Kobe Bryant, Dwight Howard, Gilbert Arenas, Gasol, and Jameer Nelson. The list can definitely go on. There is no underlying rationality to it, and it is clear I dislike watching far more players in this league that I like. This says more about me than those players.