User blog comment:Gershtoot/Black Ops PC patch released - DLC support + more!/@comment-1017446-20110326021017/@comment-2137624-20110327221924

But they all have the same things. Like, there's no change in the gameplay from Half Life 2 all the way to Left 4 Dead 2. It's still all the same, and also, Source engine is getting pretty old now.