I have never read the manga, so I haven't had any background on Rosario to Vampire before this. I give this anime an overall 7, its has funny scenes to keep you entertained and ecchi, if you're into that kind of thing. They seem to overdue it though, a few pantie shots every couple minutes. No sexy plot, just BAM! Panties and jiggly boobies.
Story: The story is 'meh.." A boy gets mistakenly sent to a monster school, where he befriends a group of clingy possessive girls who all want to date him (one of which is an 11 year old). 6/10
Art: The art isn't bad, not great either. Decent. 7/10
Sound: The sound is okay. There's random singing throughout the anime, which is entertainment I guess? The voices are pretty good, except Yukari, (in both the English and Japanese version) who's voice made me cringe slightly. She's suppose to be 11 though, so I tolerated it. 7/10
Character: Characters aren't very creative. They all want the main character to date them (or marry them). 5/10
Enjoyment: 7, I was able to watch the entire thing. It was fun, but not good if you want an in-depth and inspiring plot.
Overall: It's an okay anime, watch it if you like cheesy jokes and need a laugh. Gonzo could have done better.
Thanks for reading my review :)