Been on a Call of Duty binge since August. Started with the Black Ops series (World at War, BO, and BOII), then the Modern Warfare trilogy (COD4, MW2, and MW3), and I just finished Ghosts yesterday. Advanced Warfare is next.
Black Ops
Pros - best story, best voice acting, talking protagonists for BO and BOII, ability to choose weapons/attachments/perks in BOII's campaign, Gary Oldman's SCREAMING
Cons - WaW's mute protagonists, WaW's infinite grenade spam (especially in Heart of the Reich), WaW's infinite respawning enemies, BOII's RTS-style missions, Gary Oldman's SCREAMING
Modern Warfare
Pros - action-heavy, great setpieces, best villain (Makarov)
Cons - mute protagonists, enemies focus on you more often than your allies, feels like it's directed by Michael Bay
Ghosts
Pros - Riley, vehicular combat, gunfights IN SPACE!
Cons - mute protagonist (why is he ignoring his dad and brother?), worst villain (Rorke), horrible ending
Overall, I enjoyed BO/BOII the most and Ghosts the least.
Oh, and I finished Resident Evil: Revelations 2. Story was OK but it felt like they copied some game mechanics from The Last of Us. Its Raid Mode doesn't feel as good as the first one's.