I've been playing it a decent amount recently, and I'm really starting to get on board with the whole e-sports thing. I'm a pretty weak player (top 8 in my silver league division, which means I fall a tad short of the 40% mark amongst online players). Despite that, though, I still watch and thoroughly enjoy commentated pro games. Fortunately my best friend is nerdy enough to love this stuff too, so it's just another fun way for us to have geeky conversations.
I especially enjoy watching Zerg games, with my current favorite pro players to watch being DongRaeGu and NesTea.