For those not well versed in CoD, there's a YouTuber, XboxAhoy, who does CoD weapon guides (albeit a weekly series) that are simply the best weapon guides around. So much so that Infinity Ward actually hired him to work on CoD Elite vids for MW3!
But anyhow, for those that would like some pointers when it comes to class loadouts and guns, here's the first of his Black Ops 2 series...
Also, here's a little vid where the guy talks about the Miiverse and it's "communities" over a Black Ops 2 gameplay...