I had to go out of my way to get a good AR. (WAY, WAY out of my way)
So far I bulked up the turret a bit (bursts, accuracy, and rockets), and I was sort of playing support for it until I came across a good shotgun, then a good revolver... and now I use mostly the godlike AR I had to go out of my way for.
I play him like I played Roland. I'll likely end up using a shotgun as my main and swap around for any decent sniper rifles, ARs, or revolvers I find.