Kind of reminded me of the Master Chief. He didn't say a word throughout the entire campaign, but he got the job done. The same goes for Gary "Roach" Sanderson. I really liked MW2's campaign because I felt the transitions between Ranger missions and OP 141 missions were smooth and you always knew who you were playing as.
The Ranger missions were legit as -blam!- and so memorable. The Burger Town, the constant "RAMIREZ!" orders from Foley, the russian ass-kicking, the assault on the White House, the Tactical Nuke. Man, it's by far my favorite CoD campaign.
I just couldn't relate as much with Mason's storyline in the original Black Ops, because in MW2 you saw -blam!- was going down, the world was at war, America was getting destroyed, but in Black Ops the whole plot involves you stopping some gas from firing, but nothing really happens at the end.