To basically add to my previous post (I don't automatically judge a map based on creator, I just go by my favourite maps for this):
Mifune24 - his maps tend to be very fun, even before he completely fixes them (FFXIII Battle Theme, for instance).
CheeseWarlock - Combine musical correctness with unique mapping techniques; while he has no cemented style, his maps end up being unique, correct, and fun.
Ruduen - I'm playing favourites, since I'm only judging based off of two maps. However, these two maps (Headlock and Quinine) are absolutely fun. I don't know why more people don't like his maps, they flow wonderfully and play even better than they flow.
awp - This is a damn given. awpmaps are amazing in my eyes.