Okay, someone probably commented on this, but first of all, Marth was from the first Fire Emblem game, which was a Japan-only game for the NES, and his appearance in SSBM resulted in the Fire Emblem series being released outside of Japan. Second of all, Sonic can be unlocked in multiplayer by beating Classic mode with ten different characters, and Solid Snake can be unlocked by playing a certain number of battles on Shadow Moses Island. Third of all, the Smash Bros. series was made by HAL Labs, one of Nintendo's Second-party companies, who, like Game Freak, is sticking to making mainstream games, as opposed to casual games, so, next time you review a game by HAL Labs, or some other Nintendo second-party game (some advice: Kirby Superstar Ultra or Pokemon HeartGold and/or SoulSilver), at least take the time to bash the second-party company, and not nintendo themselves, as they usually have minimal involvement in the game, with the exception of the Smash Bros. series, which is usually based around a Kirby-style game engine.