I've played quite a bit of Borderlands 1 & 2 (check out the Playstation trophy list for Tap10lan ... hmmm, you don't see details unless you're a friend ... Become my PSN friend, then!
).
I like both games. You are in a fairly large world where you get main missions, small extra missions, and then you get various bonus points for achieving tons of mini objectives (can be killing X number of a given critter, then X plus 50, etc.)
Graphically they went for a sort of cartoony look, with marked contours on everything.
Large parts look like the Mad Max films, sort of.
Both games have a bit of a rowdy, wacky humour to them.
They are a bit of a loot fest, though. And the money you collect can be used to buy weapons, armor etc., but the weapons you buy are seldom as good as the loot drops (things you get from the enemies you kill).
And OH! One of the better things is that you can play coop. Up to 4 players can cooperate! Great fun!
IF you need a coop player on the PS3 for either game, I'll happily reinstall the game (I wonder if I've got my save files somewhere ... hmmm ...)