I'm liking it so far and at around level 11 last I checked. Its really doesn't feel that different from the first one outside of the initial environment shift...and I really hope it gets away from the Arctic Tundra theme soon because its starting to drive me crazy.

Things that Bug me:
The New UI - Hard to get used to, preferred the old simple menu that was easy to use.
Driving Controls - PC: Mouse movement is both aim and steer with no option to adjust...why?????!?!?!?
Weapon Icons - GrenadeRifle-ish guns look exactly like assault weapons..annoying
Plot - At least the first one made sense from the get go. Handsome Jack doesn't want the Vault Hunters here and yet advertises for them to come to Pandora...?