That's why I mentioned the claymores. I remember the equipment slot in MW2. Regardless, they were still everywhere in MW2. Boosting throughout the two years, and some legitimate use too. Plus, useful as shit on objective on the bigger maps than MW3. You're also clearly forgetting the going for sniper clips from late 2010 (feeds early 2011) all the way till the game fully dropped on Youtube (when sniping got really big in BO2).
I would use OMA to put C4 in front of my claymores, making the boom even bigger (since a player with lightweight could normally just run through/past the claymore's arc, the c4 ensured they would die)
I didn't go too overboard with it too often, but when I felt like going full blown camper I'd do some pretty rediculous stuff... like climb my ass up on top of highrise and drop a tac insert then turtle up with claymores and c4 and then swap to whatever I wanted to kill with like mebbe silenced famas with SP or a CB sniper... whatever. Could keep that shit up the rest of the match by just replacing the c4 or tac inserts as needed. ;3 Yeah OMA was a little bit broken. It should have just left your tactical/grenades as is and had some mitigating factor on replenishing ammo... especially explosive ammo.
Mostly that kinda thing was only fun to troll with for a while then it got boring.