I had to remove depth of field and that dramatically improved large map performances as the draw distances crippled the FPS.
I am actually enjoying the game with the performance issues a lot better than what they were upon release. The hit detection seems to be better than BOII, and the knifing appears to have improved. Like, the kill cam does not show a guy lunging 10 feet to stab at air, yet counted as a kill.
The only thing I really don't like about it is that the maps are just on the outskirts of being overly large for 6 vs 6 and there just seems to be so many random ways of being shot in the arse. For instance, I was spawning behind people immediately after they killed me that gave me an unfair revenge kill. There also appears to be a lot of "closet space" in this game which is a little unnecessary for a 6 vs 6.
As for lag, comes and goes, but it's a lot better than BOII. Not sure why people put BOII on a pedestal as I thought their dedicated servers were trash, and the blatant overt lag compensation was ridiculous and inconsistent. It is still present in Ghosts, but a lot more bearable and admirable than BOII when I was caught bull rushing into people in the kill cam that I didn't even know were there.
And I also agree, Black Ops 1 was the last really solid MW game, but unfortunate that no one got the DLC for it or it was twice as hard filling up a server with everyone having different map packs. It's the unfortunate benefit of the MatchMaking system.