I dislike the killstreaks, I mean I preferred 3,5,7. It was balanced and not cluttered full of random mini helicopters tagging you and Wall-E's going round the map. I mean really? Why implement things that would kill probably everyone's favourite CoD. I never understood that.
The maps were spot on and now they are just a clusterfu*k of objects, corners, it's like a maze on some maps.
I'm really bias towards CoD4 because it's the only Call Of Duty so far that has kept me wanting to play it constantly, I play MW3 for what 3 hours and turn it off because I get bored of it.
Anyways, rant over

sorry.