As KONAMI continue to improve the recent releases of METAL GEAR SOLID - Master Collection Version, METAL GEAR SOLID 2: Sons of Liberty - Master Collection Version and METAL GEAR SOLID 3: Snake Eater - Master Collection Version they've now added Steam Deck support.
I played through MGS1 in its entirety on my Steam Deck a few weeks ago with no issues. I started 2, but there were issues with the audio on the radio so I gave up on it. This update supposedly fixes that. There also was no way to actually exit the game without just force closing it. I can’t comment on 3 though personally, I haven’t tried it yet.
I’m glad to hear that it seems to be doing better. I really wanted Konami to not fuck these ports up