I stumbled across a website all about MW2 and the weapons, strats, maps, perks etc. And I find it very useful, it would be useful for new members to TAS.
Now some things are a little questionable on it but I guess it's all about your style of play. The author of the page often get's nukes he says so It's gotta work for some people.
It shows the damage of guns, mag size, perks and what the "pro" of each perk does, the author's strats he uses and other things that MW2 itself doesn't show you.
Check it out.
http://tmw2g.webs.com/