Very intriguing. Did not expect the terrain/liquid physics. I completed the demo's story and a few extra dungeons in the 2.4 hours.
I didn't notice any hitches when it comes to performance, but my pc is rather hefty.

Merde!

Aside from the performance issues, I'd say this is the best Borderlands game.
There's so much build variety. Even non-legendary guns can be absolutely devastating. A variety of activities in the map. Movement! It's so free. You've got double jump, gliding, grappling hook (albeit only for preset spots), wall climbing, vaulting..

Gameplay A+
Music A+
Exploration A
Visuals A++ (especially EVE)
Story, it's not bad, but nothing to write home about.