Being a major yaoi/shoune-ai fag (shitty pun intended), I thought Gravitation was absolutely shit. The romance seemed too cheesy and fake at times, but the main character annoyed the hell out of me.>>13111080
I agree with this anon's post on good ones.
Papa really was good, if a bit short. I'd have liked it go on longer, tbh. Plus, the last few minutes seemed a bit rushed, but overall, pretty awesome.
Junjo Romantica was pretty good, too. The mangas' a lot moar explicit, but I guess that's what the DVDs are for.
And of course, Boko no Pico requires no introduction, it's compulsory anon viewing.
Another shounen-ai I've seen was Gakuen Heaven. Pretty mediocre, but I didn't really mind it.