In both cases where Akamatsu's Manga was transformed into an anime, they completely destroyed it.
The was Love Hina. Mind you it wasn't really that bad the further along they went, but it did start off
horribly. Not even close to being as good as Akamatsu's works.
Then there was Negima. In one word I'd have to say that Season one was "embarrassing". Embarrassing to watch, embarrassing that they made it, and embarrassing they even passed it as potential entertainment.
The second attempt was a light redemption being that they were able to resurrect the original humor of Akamatsu's Manga, which was one reason Love Hina was more successful to start with in my opinion. However, it one could not accept the focus change that Negi was no longer the Main objective of the anime. It clearly was all about the girls. Significant characters were missing as well. That never sat well with me.