I'm not realy very good at gaming (i don't always hit evry time in fps games and my reactions arn't too great) but i can stil normally work out a stetegy 2 stop myself from embarrasing myself too badly whenever i do end up playin online or w/e, i'll flank an enemy thats shooting someone else using a close combat weapon (chainsaw in gears, sword or grav hammer in halo), or in any fps with regenerating health i'll hide somwhere then use an explosive or plasma weapon in halo to take down their sheild or most of their health, then i can hit them with omething indescriminate and shooty before the know what the fuck.
proper strategy games are a different story, my favourate is total war medieaval 2 (and the upgrades), i'll make up an army that's balanced to take on anything, enough shooty infantry to let cavalry archers know they can't beat a good honest english longbow, some heavy cavalry with lances to quickly kill of heavy infantry or misile troops, and i can normally get a good lance charge in the backs of enemy spearmen as well, if not i will distract them with the cavalry by conducting false charges and i'll let the missile troops do their work.