Chrono Trigger is a classic that makes it into a lot of “top 10 video games of all time” lists, and for good reason. I personally prefer the original SNES version.
This may be too obvious, but Super Mario 3 for NES is an absolutely amazing game that everyone should play. It’s my personal favorite Mario game, which is a pretty high bar.
On PC, Star Control 2 (now downloadable for free as the Ur-Quan Masters) is a really amazing and somewhat less known game. I wouldn’t bother with any of the sequels, which weren’t developed by the same people. The original devs are currently working on a true sequel.
One UI change that could address this somewhat would be that if multiple communities post the same link, the discussions are grouped together in an expandable box on the main page. That wouldn’t require any voodoo magic to merge the threads, and it would make room on the main page for things other than news about reddit.