Two biggest problems are the lag and spawns... Hate shooting at people for three seconds and not even getting hit markers and then getting twoshotted in the killcam.
That being said I do like the new maps, and I think they are a worthwhile purchase. Overall in style they are more like modern warfare 2 than they are black ops, so that changes the gameplay which is a plus.
And everybody acts like retarded children in call of the dead, HOW HARD IS IT TO NOT SHOOT GEORGE?!