Thing is, Borderlands was insanely boring in SP (imo) - but came alive in multiplayer.
However, it desperately needed:
- Deeper talents. After the first expansion you could pretty much max out all the useful stuff, after that you were spending just to use what you had.
- More abilities. One per class wasn't enough
- More items. Armour sets, trinkets etc. All there was worthwhile were guns.
Making it a little deeper and more interesting, like an apocolyptic, FPS Diablo would be tres awesome.