I'm gonna have to agree with Razumen and watkinzez here, I didn't play any Solid games until Twin Snakes, and when I went back to compare it to its PSOne predecessor, the remake seemed like the much tighter experience.
Sure the jumpkicking, rocket surfing cutscenes are a bit over the top, but they're fun and firmly establish Snake as an uberbadass. Plus TTS felt like it had much better controls, and first person aiming is a complete necessity IMO, as I recall that wasn't in the original MGS