I put in a Series X pre-order a while back even though I wasn't expecting to go through with it.
If I do keep my pre-order, I'll have a large backlog of possibilities, since I've never bought an Xbox of any generation before. Any must plays (excluding games that came to PC)?
Most games came to PC...
The Touryst
Sunset Overdrive
Gears (all are decent, but 1 and 2 are best, 4 is meh, 3 & 5 are equally good to me), campaign only, I don't get the MP (horde modes are OK)
Forza (if you strictly like racing motorsport games are better, but if you are not that into racing horizon series is better)
Halo (1-3 are best)
Ori (both are excellent)
Fable
Red Dead Redemption 1 if you never played it (it has been enhanced on Xbox)
Cuphead
Some games that got poor reviews, but I enjoyed (each of these games I can see being labeled crap, personal preference):
Recore - was released half finished, pretty good now
Crackdown 3 - just fun to blow stuff up, absolutely doesn't live up to the hype we got for it though
State of Decay 2 (play 1 game standard to get the idea then dreadzone mode only, normal is too easy, at least for me) - most of the poor reviews are from the buggy release and lousy multiplayer, but I can see why some won't like the gameplay loop
Sea of Thieves (some people really like it, I don't get it)