So, I just finished Karin. Gotta say, I didn't expect THAT much romance, though it was bearable. The only things I dislike about the series would have to be the little noises they play in the middle of an episode (along with some pictures of course) that I'm thinking was there for the commercial break. They sound all comical, and it really breaks the mood when it's actually serious(Other versions may not have this, I'm not too sure on it). The other thing I disliked was the entire episode devoted to Ren, Karin's big brother....they dragged it out too long. I appreciate the episode for adding to his character (which is one of my favorites) but they could have at least shortened it, and gotten back to other things.
I especially liked the ending....at first I hated it at the first half, then all of a sudden something funny happens when Karin is about to get sliced in two pieces by a vampire hunter....and then all of the seriousness just disappears, and it turns into comedy. At first I didn't like it, but then I saw they were kinda fixing the harsher parts from before. This made me like it, and the ending really fit very well. This is probably the only ending to an anime that I really like....most others make me sad, or make me thinking "That's it?" this one kinda sealed it up. Sure I want more, but this one can definitely do how it is.
I recommend it to anyone....it was pretty good, and I don't regret watching it at all.