It's definitely not a harem show.
I recently got into this one, saw the first episode a few days ago and then managed to watch two through eight over the course of the last two days. I'm loving the show so far. The characters are a lot of fun. They're basically do gooders with crap personalities. I think it's an interesting twist. It's very episodic, though there is that bigger story connect the three leads and it'll be fun to watch it play out. Waiting for the weekly episodes is going to be a pain though, it's a very fun show that that manages to move at this great pace.
Also, I freaking love Hikigaya and Totsuka's...thing. I was dying at the "please make me miso soup every morning" line a few episodes ago.