What would get you back into the call of duty franchise.
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I would make quick scoping harder (hell, just sniping in general), add vaulting over objects BF3 style (not a necessity), improve spawning, make the campaign longer with less scripting, put less emphasis on Killstreaks, and bring CoD points back. Other than that it doesn't need "fixing". The mechanics work great, and it's a great game with a great formula. No need for drastic changes. EDIT: And remove lag compensation, that crap needs to go. [Edited on 01.05.2013 6:33 PM PST]