Yeah so I'm relatively unknown to harem anime. Couldn't stand Love Hina at all but that's probably because the lead character was moronic. I've watched a few clips and plot synopses of Rosario though and it seems to make its absurdity fun. Am I right in assuming this?
Lead character in this case being psycho Naru.
You were expecting too much out a harem anime with paper thin plot
The lead character of a harem anime is usually moronic... (There are a few good exceptions though.)
Why not watch School Rumble which has what you want without harem?
Kimagure Orange Road has beat any harem anime to developed romance