This review is from: Borderlands - Standard Edition (DVD-ROM)
This is a solid shooter when you play by yourself. There's always something to do, and the quests, though simple, have lots of variety (as in many different types of basic quests). There's a ton of items to find, and the combat is very fun and challenging. When you play it with a friend (3 is ideal) it is 10x more fun. There's more strategy to it, everything is balanced well and rewards are shared. The graphics are the coolest I've ever seen in a video game and the sound quality is decent. Be warned, there isn't nearly as much drive to play this game by yourself than if you have people to play it with.
Basically, it's an amazing co-op game and average single player game with amazing graphics.