I love playing online but I find that living in Australia you are hard pressed to find a server that has a low ping, full realism settings and isn't empty.
Currently COD only seems to have about 7 servers and only one has an acceptable ping (Syndicate). However since the hotfix/patch fiasco I can't seem to find anyone on the Syndicate server when it is evening in Australia during the week. The other night there were 5 people on it, I joined up and they all left within a minute of me joining
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I'm suffering from the MP sound bug, and now to make matters worse I lose FFB when I pull the trigger in MP. So multiplayer is dead for me at the moment. Single player is starting to get tiring as the AI is just too aware.
As MG said the sound is going to take months to fix, I think they should try to make SP as enjoyable as they can, by giving us more control over AI settings in the Quick missions etc, and the dev team need to work on toning down some of the AI's behaviour.