Here are the top ten most played games on Xbox Live (based on users playing), for Xbox 1 and 360, from Major Nelson:
Xbox 360 Top Live Games
1 Call of Duty 2
2 Ghost Recon 3
3 Oblivion
4 BFMC
5 Final Fantasy XI
6 PGR3
7 Hitman: Blood Money
8 EA SPORTS Fight Night Round 3
9 Perfect Dark Zero
10 Rockstar Table Tennis
Original Xbox Top Live Games
1 Halo 2
2 Battlefield 2: MC
3 Counter-Strike
4 Splinter Cell Chaos
5 Pro Evolution Soccer 5
6 Rainbow Six 3 BA
7 Star Wars: Battlfrnt 2
8 Madden NFL 2006
9 Forza Motorsport
10 Ghost Recon 2: SS
If the lists were combined, Halo 2 would be at the top, and then all the 360 games.
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