I like to watch streams and videos of players that know how to commentate and/or make it fun. Draskyl, Purge, Pyrion, Daily Dota sometimes. I'm not really into the pro e-sport aspect though, I just don't care about the teams or the players so it's hard to get anything out of it. But that's true about all sports, for me.
I mostly watch to learn or to get some laughs out of it. Wouldn't exactly call myself "mesmerized" by it, well, maybe sometimes.