Playing HQ?
Ideal Class:
Primary - AK-74u (You won't get anywhere with any other SMGs)
Attachment(s) - I recommend Extended Mags, or Grip, if you're using the 74u.
Secondary - What ever floats your boat
Lethal - Semtex/Frag
Tactical - Nova Gas
Equipment - Anything really...
Perk 1 - Lightweight/Flak Jacket
Perk 2 - Steady Aim/Warlord
Perk 3 - Marathon/Hacker maybe?
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*Nova Gas is definately a MUST! It's brilliant for clearing out campers, or for use as a distraction, or for flushing out the HQ.
*Flak Jacket preferably for the more aggressive player, who wants to capture the HQ.
*You might want to use Hacker if you're playing against one of those teams who whores claymores.