Of all the hands you posted, I dont think any are really misplayed. Definately some sketchy spots though. Onto the hands..

Whenever I see someone minraising like this, it usually means they have a flush draw. However you said he was pretty bad and had been doing it before. I dont think he would overplay a lone king like this.. I probably fold this.

Hand 2. He is a tag, but this is the perfect board to slowplay a big hand. Unless he has been out of line, or you guys have history where he makes big bluffs like this, I fold this too.

Im confused by hand 3.. Why do you bet so small on the turn? By the river it looks like the straight got there. I file this under "dont get attached to 2 pair" and muck.