Contact Mossberg with your concerns and ask if they will fix the problems. Yours is definitely not typical for a new gun. I would say that the 870 might be a shade smoother out of the box, but not that much different. Mossberg should take care of you and I wold also talk to the FFL dealer that sold it to you. Maybe it sat a long time out of a safe or something that affected the finish.
“Malo periculosam, libertatem quam quietam servitutem." (I prefer the tumult of liberty to the quiet of servitude.). Thomas Jefferson
"All that is necessary for the triumph of evil is that good men do nothing."
-Edmund Burke, Loosely translated from Thoughts on the Cause of Present Discontents. (1770)