how serious is screw hole in exterior of new motorhome

One of the few solutions I would NOT accept if this coach is painted is to fill, sand and REPAINT that area. MUCH more likely to show as a problem down the road than a small painted screw head, rivet, etc.

Spent too many years running automobile dealerships and know an exact paint match can look good for awhile, but is very likely to not weather the same as the rest of the coach.

The rest-- as to whether to accept or reject is philosophy and that is YOUR personal decisions.