I find ranger to be most rewarding, most fun, most-thought provoking. It was designed to be played on ranger.

Supreme Jerk ramps up the difficulty that meets my standards for this kind of game.

The other difficulty levels feel like a tutorial.

The one after rangers is hard but enjoyable (Though the first fights in my first playtrhough were a hell of reload 3-4 times).

i saw that you can switch back the difficulty ingame! this is great :D
alwys prefer this as i start mostly on last difficulty to deep in games fully so you need to understand the games and the world instead of just rush through!