The author of this thread has indicated that this post answers the original topic. Yes definitely buy it, the multiplayer servers aren't shut down they are just not very populated, you can still find games on vanilla WaW as well as plutonium WaW. The community and mod scene is still very much active on here.
Campaign co-op features up to four-players online, allowing gamers to experience harrowing campaign missions together for greater camaraderie and tactical execution.