The greatest single-playthrough game would be a fun category. I think my picks for that might be What Remains of Edith Finch, Gone Home, Broken Sword: Shadow of the Templars, or Grim Fandango. Fire Watch would probably get an honourable mention.
A "pinacle of a (mostly) defunct genre" category might be a good one too. I would argue that Command & Conquer: Red Alert 2 is the best isometric RTS games ever made.
"Our community" feels a bit monolithic. It's like saying "film watchers" or "readers". Lumping anyone that plays video games regularly into a single social group feels unhelpfully reductive.
I played through 1 - 4 and honestly, I think 4 was the only one that was actively good. The others might once have been fun, but they didn't really hold up. However I had a great time with 4. I particularly liked the epilogue.