The only gun-wank game I own is CoD4:World at War. Multiplayer was meh. Solo campaign was more meh, but I really just bought the game to play with the period weapons in a World War II simulation. So mission sorta accomplished. Plus I played with some nice folks online. Except for that one guy who kept hiding in the shadows by my spawn....
I think multiplayer is generally a meh thing which will have benefits... eventually.
Most Momorpuguhs are grind-tastic and most Mumofips are shoot-em-ups. They both get re-packaged and re-sold because the publishers want another serving of your disposable income. It should be obvious that its harder to keep a Momorpuguhs fresh because that usually requires whole new territories or new aspects to existing gameplay. Mumofips just get new skins, and different colored levels. Its much harder to code a new area of sandbox than skins and levels. Once in a while someone will come along and do something slightly different - which is the benefit part. Brink had interesting new idea(s), but still got lost in shoot-em-ups with control points. Points for trying, I guess - but Brink won't have imitators because the fundamental gameplay is still control point-driven warfare. Even the fancy (annoying, says I) new 3D is still just new skins and level colors. Until something really novel happens in the way of fundamental gameplay, the reiterations will continue.
I'm counting on this regurgitation to depress demand, just from sheer repetition. I tend to think it is working out that way, because of the Black Ops putrescence. Apparently somebody thinks that the games need to ramp up the grit and racy content to help sales along. In general, I don't think that is a good thing. Fortunately, there's a limit to the vulgar titillation they can insert before the game becomes obscene. [Though I could *totally* see more titles getting X ratings in the future - and liking it.] At some point in time, the dreaded innovation has to come. Nuclear Dawn and Natural Selection 2 are baby steps in the direction of new kinds of gameplay - but they were new 8 years ago.
Its all a big, rusty, calcifying machine, and I'm hoping something else will break.