I played through MGS and MGS4 at the times of their release, but I decided earlier this year to buy the HD collection with the intent of playing through all the games sequentially to hopefully wrap my head around this insane story. I played through MG and MG2, but then paused to watch Metal Gear Scanlon instead of replaying MGS1 myself. Of course, this wound up falling to the backlog, and only over this Christmas vacation have I really had the time to dig in.
I just chain-watched all of Metal Gear Scanlon 1 and loved it! It was a perfect mix of nostalgia for the pieces that I did remember, surprises of the stuff I had forgotten, brand new Easter eggs, and fruststration/heartbreak/satisfaction/relief from Dan, Jason, and Drew.
But now the reckoning has come: do I watch Scanlon 2 or do I play the game for the first time myself? I don't think that I'll want to playthrough the whole game and then watch someone play, though maybe episode-by-episode play-then-watch or watch-then-play in chunks would be appealing. Experienced MGS2 GBers, what do you say?
EDIT: I just played through the Tanker chapter on my own. I think I'll both play and watch, and just make sure I never watch ahead of where I've gotten on my own. Thanks everyone for the suggestions!