IMO, weak male leads in harem are a hook to lure the male-otaku fandom in need of socializing with women, since they can somehow relate to the weak/unlucky guy. Or at least they were back in the 2000 or something. Now, IMO, the harem trend seems to be wearing off a little (or it may be that I haven't really watched anything
truly harem after Love Hina--which I loved BTW
. I'm ruling Kanon out, anyways, so...).