I think "Masks" and "Genesis" receive too much hate. They're high concept ideas that are well-executed (the former gets to show off some terrific production design and art direction; the latter is a show case of some great make-up effects).
I'm stumped as to what value "Shades of Grey" might have, though. The framing story is clunky, and the use of flashbacks are padding, not insightful. At least (most of) the clip shows on Stargate SG-1
used their framing stories to push the series forward and develop the characters, even if the use of clips was still padding to reach 42 minutes on a shortened schedule.