I thought the love hina manga was just okay. Not good and certainly not great. It's just like a stupid pop song, it had it's moments.
The anime, however, totally sucked. Any of you see that christmas episode where keichi broke a leg? At least in the manga, akamatsu drew the crutches correctly. In the anime, the crutch was on the wrong side! Thus, the animation for that character was so awkward, it was embarrassing to watch...
I haven't really tried negima or ai love you. Are these any better?