Snake was already in Brawl.
They barely did anything to him, the main point of MGS is sneaking anyway.
You must understand, while Rayman has taken over Banjo's place as my favorite character (with Banjo dead), Snake holds a very close third place. And I've only played one MGS game. After many hours of reading the story of the games, watching videos, and eventually playing Ground Zeroes (which I loved), I've come to hold the series and Snake very dear, even if I'm not a "proper" fan.
Though I want Rayman far more than any other character, even King K. Rool, Snake is the only one on par with him by how much I want him in the game. And by virtue of being a veteran, I feel like Snake deserves to come back even more so.
This is the Rayman support thread, but it's still my thread too, so there'll be a fair amount of Snake support flowing through here.
Prease understand.