User blog comment:Callofduty4/Why is it a sin for Treyarch to rip some aspects off of Infinity Ward but OK for Infinity Ward to rip off some stuff from Treyarch?/@comment-1079585-20091225164010

The revive system only exists in Special Ops. It's a very minor thing. What's the wave system? The Ranger's model is totally different from the DB in WaW. Also, IW was the one that made Call of Duty, and specifically the IW 4.0 engine, in the first place, so they definitely deserve at least partial immunity in terms of being judged for taking things from Treyarch. And Treyarch ripped off a hell of a lot more than what you said they did, the biggest thing you missed being Perks. The fact is that WaW did almost nothing to innovate on CoD4 while MW2 was vastly different. I somewhat agree with you in that Treyarch doesn't deserve all of the shit that they take, but they do deserve some of it. Also, the homophobic slur was very unnecessary.