Completed......
Game's title and my favorite feature
God father 1,2 - favorite feature - expanding territory, re-playable (if you are movie fan)
Mafia 1,3 - Mafia 1 - story, Mafia 3 - expanding territory
Bioshock 1,3 - 3 is favorite (graphics & action)
COD 1,2,4,5,6,7,8,9,10, & 13 - COD World at War is favorite (Historical setting, finale is great)
Far Cry 1,3,4,5 - 3 is favorite (environment, capturing bases)
Hitman 1,2,3,4,5 - 5 is favorite (Action-stealth balance.)
NFS 2,4,6, 9,10,11, 16 - NFS Most Wanted is favorite (Leveling up mechanism, super crazy racing)
Other completed;
Assassins Creed Revelations, Max Payne 3, Battlefield 2/3/BC2, Crysis 1 & WH, Delta Force 12,5,6, IGI 1,2
I think, now these game series are dying....
COD - same boring template, too "modern" war mechanics
Far cry - same boring template
Hitman --- too much stealth
NFS -- out of ideas