Just played some metal gear online, after a year of not playing and I forgot how incredibly good it can be.
Though it can also be incredibly annoying if there is even a slightest bit of lag, which make CQC'ing impossible. I've stabbed people in the face, only for them to turn and shoot me in the head and we both die, people have grabbed me from 3 meters away, grabbed straight through people, grabbed people only for them to magically still headshot me.

The worst one had to be where I fired an entire clip on a guy who was lying on the ground, I then had to reload, he stood up, fired and we both died. I wasn't even firing anymore...
That is the kind of shit why I prefer xblive, even if it means paying.

Though like I said, it can be pretty incredibly awesome when it all works correctly, my last few matches had very little lag so that was awesome.