I thought the multiplayer was boring and uninspired. Spys versus Mercs was much deeper. Co-op from Chaos Theory was much better.
I enjoyed going through the story but otherwise the entire game left me flat. By far the worst splinter cell. If you want to run through crowds of A.I. spamming bombs and mines, then just mark and execute everyone else, you might like it. A friend of mine said it best after having played Conviction and then Double Agent, that Double Agent was a completely different, better game, in every single way. And Double Agent is nothing compared to Chaos Theory. Although, Conviction made me appreciate Double Agent more.
Either way if you can stand renting it, it doesn't take that long to get most if not all of the achievements and do everything there is to do.
