Stopped at WWII.
Liked COD4. MW2 was a blast to play with friends but I gave up after 6 months due to the hackers, bugs, unlimited rockets / pave low glitches and no-scoping. Awful community.
BLOPS was great, much more balanced than MW2. MW3 was underwhelming, terrible maps.
BLOPS2 was solid. Ghosts was solid too, but but the maps were too large.
AW wasnt my cup of tea. Neither was BO3 or IW. WWII played at a friends house. Found it boring.