Eh, its more of a 'it's me, not you' kind of sentiment. The nostalgia of loading up some of the originals and candidly having more chunks of time on hand to drink in the set pieces on launch day is strong. Some of my fondest memories of COD aren't the great MP matches I've had, but the fond memory of those tanks rolling over my head when in the trenches of COD2, or the surprise when you got to take control of the AC130, or the high I felt when I first nailed the mile high achievement.
Now, I take the wrapping off (or load up the install more accurately), hop into MP, feel the familiar controls in my hands and set off to explore ten new MP maps and left trigger/right trigger. It's great, and arguably the best 60 bucks I spend each year, but realizing that what originally drew me into these games and dominated those launch weekends has taken a back seat to something that is fresh yet almost always predictable is a bit of a bummer.
I remember wanting to watch the newest campaign trailers over and over, drinking in the details. But now, its as if I could care less about what the reveal will bring tomorrow unless it focuses on MP elements. Not sure if that makes sense, but I miss that draw the SP had all those years back.