I don't know why everybody chastises CoD sound - I actually happen to like it, especially the "dynamic" components. You can actually *hear* if your crate runs at the right mixture and such - and while modded 1946 sounds are, by themselves, really great, I can't remember that they are able to reproduce this additional level of immersion.
As of now, I prefer CoD sounds, to be perfectly honest.
The sound configuration options in CoD, on the other hand....