Louise and Nagi might as well be the same. Both are terrible bitch ass niggas.
Hayate season 1 was HILARIOUS. It doesn't matter whether it followed the manga or not, hell nothing matter if it follows it's original source EVER, and season 1 was godlike. Funny as hell, hilarious cameos, good animation overall, better music, better everything.
Season 2, no matter how much of a fan of JC Staff i am nor it being more canon is, was not that good. It wasn't as funny, they lost most of their major anime licenses to make fun of, the animation seemed lesser.... that or maybe the overall style was just changed, i can't remember been a while.... And the "action" wasn't as good. In season 1 it was hilarious even in the fights and actually had substance too it.
Season 3 it seems is a totally new story written by the main author? That sounds kinda cool actually, MUST SEE TO JUDGE.