The form and function of the Borderlands 1 skill trees are correct. The color begins where it is should and correctly fills in at 20 skill points.
Brick’s skills scale as they are supposed to. He is perfect.
Krieg’s Strip the Flesh still shows 3% explosive damage at all 5 levels instead of correctly going 3, 6, 9, 12, 15 as the fight for your life bonus correctly does.
I checked all of his other skills and they were fine.
Claptrap’s All The Things Are Awesome! is not right. Claptrap’s personal benefit is supposed to be +3% Fire Rate, +3% Weapon Swap Speed, and +5% Health per level. In the skill builder only his gains when allies join scale correctly.
Pain Simulator is Painful scales correctly for the maximum health, but does not scale correctly for the Damage Reduction. For that it should go 4.8%, 9.1%, 13%, 16.7%, 20%.
Organized Guns are Happy Guns only scales correctly for the teammate bonus. Claptrap’s personal benefit is supposed to be 5% per level, not 2%.
I only checked my favorite characters from each game. Hopefully I caught everything for them.