Recommend away !
I'm really not a fan of anything halo tho.
Does Gears of War hold up ? FH is definitely on my list.
I'll break this down to my personal picks on Game Pass (games that I completed) to games that I know are generally well regarded/well liked by the community. Again, the below can all be played on Game Pass.
Personal Picks
1st party - Ori and the Blind Forest, Ori and the Will of the Wisps, Prey, Evil Within 1/2
Indies/3rd party - Death's Door, Tunic, Jusant, Plant of Lana, Cocoon, Lies of P, Solar Ash, Bramble, Amnesia the Bunker, A Plague Tale Requiem, Celeste, A Short Hike, TOEM, Teenage Mutant Ninja Turtles Shredders Revenge, Somerville (not liked by a lot of people, but I thought it was enjoyable), F.I.S.T.
Community Picks
1st party - Psychonauts 2, Hi Fi Rush, Forza Horizon 5, Grounded, Starfield (not overwhelmingly positive but worth a try regardless), Gears of War (I'm not a fan of the series, but since they're all on Game Pass, they're at least worth trying), Pentiment, Lost Odyssey (not on Game Pass, but can be purchased for $6.24 (on sale right now) ).
Indies/3rd Party
Remnant II, Dead Space Remake, Sea of Stars, Rollerdrome, Fuga Melodies of Steel 2
I'm sure I'm missing a bunch but these are the ones that stick out to me. And of course, I'm sure others will have different picks as well.