I couldn't agree more! I had more fun playing Salvador than I did Axton or Zer0, but they're all fun! I find the best thing to do once you've gotten through the game, farmed until your eyes are bleeding, and have exhausted all value from beating challenging enemies is to grab a version of WillowTree and just mod your guns until they're perfect.
I've been playing around with an Unkempt Harold that shoots 47 shots at once! Combined with The Bee (even the new one), I was able to take down Hyperius in 4 shots! Unfair as anything, but once you've beaten the raid bosses so many times it feel fantastic to just tank them immediately.