A missile launcher is integral to beating Snake's Revenge on the NES, as well as for dealing with a number of Metal Gears throughout the series. Not sure if your argument is entirely fair to say.
That said, if you're talking about what fits best, you should be complaining about his Up-B. Nobody in the game ever rides a Cypher camera, and it's never had an electric effect like that.
he NEEDED a gun, and his knife, he is fightning people size creatures and humans, not metal gears
plus, have you ever played MGS1 for ps1 and the Twin Snakes for Gamecube, MGS2, MGS3, and MGS4?, because I had,..
and if you did, then you should know that snake mostly uses a handgun and and his knife
I dont care about that cypher camera, It could be broken, thats why It has a electric effect! lol,
Me and my friends (MGS fan people also) got annoyed when we saw snake in brawl without being able to use a handgun,
we just thought : he is not snake.., -_-