While I can't really fairly judge them as a whole (as I only played Modern Warfare 1 Wii and Black Ops 1 PS3) but from both of them.....the former was good while the latter was a slog to play though

.
Modern Warfare was very impressive to me considering it was my first COD game I ever played; the single player levels had lots of verity, the visuals (even on Wii) were very impressive and the story was okay too.
With Black Ops....I just didn't really like it from the start sadly

. The visuals looking very....drab? (I think :l...) The gameplay being almost EXACTLY the same as MW1 (don't mind that....but the level structure was almost 1-to-1 with that game to me :l), and many of the missions were very boring to go through. The only missions I fondly remember from my experience from the game was the Prison Brake Mission and the Rooftop Mission (where you have dual hand-guns and are running from rooftop to rooftop killing waves and waves of foes at once; was fun to me

). Granted, I didn't beat the game (as I just....didn't want to play it sadly

), but I really didn't like it too much single player wise

.
I'm sure other COD's had stronger single player modes but.....I guess the series just isn't for me :l.
Granted, I did enjoy the multiplayer for both games

; got to level 12 in Black Ops before I traded it in and got to level 35 in MW Wii before I stopped playing it

.