Very nice guide, helps a lot for some of my plans with krieg.
About the Force skill, I've been raising it and it's a nice skill. Not as powerful as, say, divine force, but its damage is distributed between 3 hits. Plus the last hit stuns (and is pretty wide) so it's good for 1 point.
Also, pressing space bar twice after the third hit makes Krieg do 2 attacks (second has AoE) with similar animation to Divine Force's last 2 hits (he uses only 1 hammer). They don't hit downed enemies like DF, but each does damage equal to Krieg's entire damage range so Force can generally mean 5 hits, first 3 based on the skill and last 2 based on your damage range... so that's why I like it (not sure if i want to max it after RB tho)