It was a new engine on PC with DX11 and destruction. That's what pisses me off even more with CoDBO. It's the same modified engine that doesn't have anything ground breaking in it. At least DICE had public betas in an attempt to get feedback, Treyarch never even had a PC beta and if they did they would of had time to fix it before release.
I wouldn't rent one even if the game rank smooth as silk. Far too many restrictions and a shitty GSP is hosting everything.
Problem with CoD4 isn't that there are no servers, it's that there are no players on the servers. Renting yet another empty one will do nothing.
As you can see from the overlay once the cpu load goes below 100% mouse becomes smooth. So all signs point to a bad console port :P