I'm actually surprised with how easy the lumber is to shoot, considering that I've only used it about 10 times since its release (I don't gun much). Sure, I can't hit jack (heh...) at extreme long range until I've had a clip to judge the drop with, but even at fairly long range lesmok makes it pretty damn easy to hit with.
That being said, I don't think it's OP. There are some pretty simply counters, just like with any other gun.