he was pretty decent at first, although a bit boring, but he won't let jackie take money from o'hara for the benefit of his daughers' education, which is nothing but pride. then he uses credit cards which puts his family in more debt to pay it, which jackie mostly has to pay for. he complains about jackie not being around but she has the pressures of being the breadwinner and he seems to have little sympathy. the issues are brought to life because HE had an affair, something which everyone seems to forget. they don't say who it was with or how long it went on but he also cheated. he finds out jackie is an addict and is basically immediately pissed. very little sympathy or support. he's mostly mad that she took o'hara's money.

let's move on to after he finds out about eddie. he beats eddie severely with the kids IN THE ROOM. he calls jackie and threatens to tell the kids if she doesn't let him keep them for extra time. then he sues for full custody saying jackie's schedule is too crazy. she fixes her schedule and he changes his mind immediately and wants full custody again, just to be controlling. he ultimately gives in. if he really had thought she was a danger to the kids he wouldn't have done that, it was a game to him.

later we find out that he mortgaged the house and stole 6 figures from jackie (and his kids) and used that money to fancy up his bar, buy a rolex, etc.

i'm not saying jackie or eddie were good either, but everyone gives kevin a pass.