Paladin = Crusader. I haven't started one yet but I've seen some higher-level ones just plain wreck shit, but like the barb they look boring to play. I have a somewhat built DH but he just dies so easily. The leader boards are full of DH's, as their damage is the highest out of all chars, but I imagine they struggled with dying A LOT before getting that high. Playing online with barbs and other tanks probably eased that path for them.
I like monks because they're 2nd best at everything across the board like health and damage.. very maneuverable, too, like being able to jump over walls with dashing strike. They're the most fun to play as, imo.