I actually played this out of guilt, it was bought for me for christmas by my Parents so I figured I'd better give it a fair go, I'm not a fan of multi-player online games having sworn off of them when i closed down my WoW account last year (and even on WoW the only person I actually spoke to or played any quests with was my gf) so I stuck solely to the single player.
Having said all that Borderlands was a game I actually enjoyed, but I can understand and agree with some of Yahtzee's opinions, the menu system is awful, the car system is just as bad until you get used to it, but even then you can still end up getting the damn thing stuck on a pebble on the road, leaving you with no choice but to get out and walk anyway.
The story felt as though it was added as an afterthought and by that I mean there really wasn't one, the missions in general didn't add anything to the story they were just things you did to get access to the damn vault, which also turned out to be a letdown.
But even after all that the game kept me entertained enough to not only finish it, but to have finished it twice and started chewing through the DLC, the first one of which actually had a better story than the main game.