Ive been away from MAG for awhile and the only reason I stopped playing is because it started taking an hour to get into a game. So I started playing Black Ops and then came Battlefield 3 and MW3 ok games but I loved MAG for the huge maps and massive number of players playing together, if its still playable ill jump back in, and if its dead please tell me theres a MAG 2 coming out.
I've just come back after several months and looks about the same numbers online not much but enough to get into games...weekends are obviously the better times to play....you'll see me and my alt "RebelSword" back on raven.
its not dead - i just started and love it- it does take a while but not an hour maybe 2-10 min depends on the room. Try joining a clan an jump into one of their games - it maybe near the end or the begining.