I've been playing Uncharted 3 almost everyday since the Subway beta, and I'll admit, it's slowly starting to all get stale for me.
I've played on these same maps, day-in and day-out for months now, played the same old game modes for almost the past year.
And you know what?
I'll be back tomorrow. And the day after that...and the day after that...and the day after that...etc.
It's so weird, to be honest. I've never played a game where I still had fun even though I know deep down it's getting old.
Until the next Uncharted game comes out, or until ND stops supporting the MP, I'll keep playing. Maybe not quite as often, but I'm still going to continue.