Im lvl 50 Guardian rank 117 and finished the normal game mode and the true vault hunter mode 100%
In the normal game Iron Bear was really helpfull and the scaling was good.
In true vault hunter mode or Mayhem mode Iron Bear (43k hp + shield) dies really fast same with technical Vehicle ist to slow and die to fast… I only hits ~5k dmg with nuclear bomb and fire railgun with ~300-500 dot. With my Weapon i hit 5-10k hits per second and have 1k-3,5k dot.
I only use Iron Bear to recover shields in some situations.