Yes, some do, shooters do have stratagy if they are objective based. To attack a defended positon, simply being good will still have you shot by the other half of the enemy team that you didn't kill with your god-like prowess.
While an amaising player can fuck up a good solid stratagy, much like a retard can cause it to fail. Its harder for them to stop it, if you blindside them, in most shooting games, they're dead. I'm mostly a TF2 man, so tactics beat player ability most of the time, unless they get lucky. A multiple ubercharge with a spy sapping at the same time = Dead defenders. Unless the defenders have tactically aware pyros to push back the ubers, and a heavy or someone to take out the spys while the engis fix everythign to mow down the non-ubered people.
But on the other hand, you have halo 3 online.