Recommendation engine: Downvote any game you've heard of before
This might be a slightly unusual attempt at a prompt, but might draw some appealing unusual options.
The way it goes: Suggest games, ideally the kind that you believe would have relatively broad appeal. Don't feel bad about downvotes, but do downvote any game that's suggested if you have heard of it before (Perhaps, give some special treatment if it was literally your game of the year). This rule is meant to encourage people to post the indie darlings that took some unusual attention and discovery to be aware of and appreciate.
If possible, link to the Steam pages for the games in question, so that anyone interested can quickly take a look at screenshots and reviews. And, as a general tip, anything with over 1000 steam reviews probably doesn't belong here. While I'd recommend that you only suggest one game per post, at the very most limit it to three.
If I am incorrect about downvotes being inconsequential account-wide, say so and it might be possible to work out a different system.
A fun little 2000 era RTS with customisable mech chassis units/base building/multiple fighting levels per map (separate air/land/underground maps). In hindsight, it has a fiendishly difficult campaign which I remember it being a lot easier than I find it now...
Yes! Great fun game. Crashes for me every so often in Windows now, which is a pain especially for skirmishes because you can't save. Have installed in Linux now but haven't tested much - maybe it'll work better!
I always loved the combot customisation aspect, but it seems my favourite load-out and team has changed since I played so many years ago, back when one borrowed a friend's CD.