Last night, it was actually semi-unplayable for me. Since I had the Blu-ray problem last year myself, I pushed it, and I am in the mid-eastern US region. Today, after about a week of frustrating lag issues, I was able to play lag free, as far as the messing with true game play issue.
Before last night, and the night before, I had no lag issues, unless My internet was messing up, then the last 2 nights, no matter what my PS3 or hard connected PC to the router said as far as a speed test said it was good to go, CoD Multiplayer was slow/lagged to the point of not being able to finish a game. Today though, was near flawless as far as normal game play. So hopefully them taking this to virtual or dedicated servers is starting to iron itself out.
Once again, hope it helps.... lets test to see if tonight's connection is good. lol