Okay I'll admit I was a little ashamed of myself for having watched this series but in the end I was only watching it because I read the manga.
Story- Generic storyline three please (alien girl/guy meets human guy/girl they form relationship, harem scheme, ecchi, and that's about it) yep that's about it. In terms of sticking to a storyline this series did really well of sticking to the storyline introduced in the manga.
Art- I liked the art and I love the animation things were never all that choppy or gritty and I'm happy to say that I was able to borrow it on dvd rather than having to watch 360p streamed crap.
Sound- I liked the voice actors in japanese and but I felt the background music was sometimes a little annoying rather than supporting to the story the opening made me laugh because well it kind of is good description of the series.
Character- Character development was actually pretty good. I knew and understood each character relatively well by the end of the series...okay yes there were still a few questions but all good things leave you at least asking one question and this is especially true since if I remember correctly this only covers about the first three volumes on the manga.
Enjoyment- I liked it I mean if the occasion comes where I have to watch this again I won't complain but I probably won't be going out of my way to watch it.
Overall- I suggest for this to people who like ecchi/comedy/sudden girl friend animes and don't mind a little romance thrown in there; its a cute story that I for one think is pretty enjoyable if not a little generic.