A bit guide-dang-it?
Great sky, at least the Regi ruins were in something easily recognisable and translatable, and (relatively) let you know what the heck you were supposed to do.
Then there's the fact of how long I spent trying to find the two missing plates, only to find out that some guy already took them... after talking to him and getting them from him by coincidence.
(and then I go on for a while)
Simple facts: almost impossible to translate (exactly how many people think 'it must be a cypher!' then start matching things up to letters, read things backwards, and/or alter cypher by letter jump on every level?), intresting seeming story if you can, could have been given SOME role- if the designers had decided to not Railroad the entire game so the entire storyline missed an entire third of the region.
Managing to actually reach the final floor can give you a great sense of achievement, though.
On my first time in the ruins? I didn't even KNOW that there were other floors, so I was pretty much just item hunting.
Yes, somewhat gimmicky, for all the potential plot worth (if they hadn't, y'know, Railroaded it out of the storyline)- they just seemed to want to mess around with their Dive HM (see, maybe they should just remake RSE so they can do that instead. Or have put other Dive spots. Or something)
It would be nice to know what the unknown(unown >`_> <`_<) symbols represent.
"defeated (a) alone" and "(b) joined" apparently switch symbol between the two games (I only own [En]White, so I can't check the validity of that (upper left is "human-shape" pattern, upper right is "unown eyes" pattern)), so possibly a record of the Tao war? King one of the Brothers? "called (c) beings" probably implies a group of Legendaries that has a name, and "(d)" is seemingly the name of the "King" reffered to throughout.
Some of the messages match up to the Gen IV library books (specifically 2F.)
3F's "Saved all from waves" line might imply that it was the King who prevented the ocean from covering the ... Palace? so possibly the King disappeared/died and the land sank/ocean reclaimed it, or that it was at least a percieved power granted by... something.
So, my conclusion is: they wasted something that could have had some really interesting bearing on the plot. N is the "King" of Plasma, and including the more recent official revelations about him and looking at the stuff that is written in the ruins there seems to be some prominent connections between what is written and what we know. The crown from the Intro scene, which looks exactly like the Relic Crown save for age; the fact that the Ruin is filled with Arceus' plates and Ghetsis had the Creation Trio's Orbs.