I don't mind the building too much, i just don't try to go nose to nose with a bob the builder.
I've had to adjust my playing style a little. Usually i'd just grab a gun and ammo, rush into the fight. Its better to hang back, gather up your resources, let the noobs bang heads with each other. I look for scoped weapons and engage at longer distances. If you have a supressed weapon it doesn't show the direction the hit came from to the person thats shot so you can plink someone from a distance and if you use a pistol, most have pretty good damage, so just one head shot or a couple body shots and they are done