Roger or another veteran can pine in, but having just finished Bower's RED BOOK on Morgans (I'll finish the Double Eagle one tomorrow ) I can tell you:
The striking quality of Morgans at the New Orleans (O) Mint were consistently lousy. Why they never got better over the years I have no idea. Clearly, they weren't reading this website.
San Francisco Mint had usually the best-struck coins for Morgans.
Philly and Denver (when they got in the act) were usually 1st or 2nd or 3rd for a particular year.
From a collector/numismatic POV, strike quality and luster matter.
From a minting perspective, the higher-ups at Treasury or Philly may have not given a hoot. They figured all the coins were either going to get worn in circulation or stay in bags -- who cares about luster or strike quality ?
Anybody who complained could just go buy the proofs, if available, right ?
Anyway, the lousy surface quality and strike quality for Morgans comng from New Orleans and the usually good quality from SanFran easily got drilled into my head from Bowers' RED BOOK.
Not sure I got any Mint segmentation on quality from Bowers' DE RED BOOK (finishing up) or even from Roger's SAINTS magnus opus. The details are there, I just can't recall any particular pattern Mint-wise 8 months after reading the book.