I'd like to jump on the bandwagon and say that I had a much different experience with this game than the reviewer did, while certainly not an incredible work, I found that Metro 2033 provided me with something that I've been missing from comparable first person shooters recently. I played the PC release and found a game that to me seems more like a throwback to games like Half-Life than it feels like a game from the current generation, which to me is a good thing, possibly because I'm a curmudgeon and hate everything new.
Between a relatively understated narrative, reliance on iron sight aiming, and a near constant tension caused by the all-or-nothing stealth approach to the firefights against other humans I found myself enjoying Metro far more enthralling than your standard Modern Warfare or Gears of War-style affair. I may have simply been in the mood for a survival-horror game at the time.
While I enjoyed the mechanics and atmosphere of the game, the AI was really nothing to write home about, and many of the environments, while breathtaking are not necessarily imaginative places in which to shoot men in the face. Overall though, Metro 2033 is probably a game that's both interesting enough and short enough to come back to again in a year or a few months, which for me is far more than I can say for Red Faction: Guerrilla which I received with this one in a bundle deal on Steam.