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-1518024-20091227221836

Oh yeah one thing Infinty Ward should of taken from Treyarch was the ability to play with anyone on spec ops. When none of your friends are on it's annoying.