hand 1: easy fold on the river. I like how you played the turn. Pushing against a maniac and folding against a nit are both options. I don't think you're ever good on this river.

hand 2: seems ok.

hand 3: I'd call. TPTK = nuts, I don't care what anybody else tells you. Ok, I might be 3rd leveling you to a point, but sometimes it is true, and against an unknown with half a stack on a drawy board, it most certainly is.

hand 4: I can't say I like the goofy large preflop raise. Maybe with a legit big pair against a lot of maniacs I'd like it. I don't really see the point though to be honest, but maybe I'm off base. I don't really know what to think about the turn or river. Use your imagination. Half pot seems reasonable given how much weakness he has shown.