Personally I cannot get all upset about some small tooling marks in the inside of the slide that cannot be seen when the pistol is assembled and have no effect on function.
I have several custom pistols and rifles, and they are all tools designed and constructed to do a specific job. Looks are nice, but design, function, reliability, and longevity are the critical attributes that I look for in a good gun.
I feel that the Rohrbaugh is a fantastic gun for a very reasonable price. If there is a defect affecting performance, then I would be concerned and would make sure that the manufacturer corrected it.