Well, that depends.
for example, if Super Mario Brothers had never been released, that would mean gaming probably never took off. but, avoiding that timefuck, if Galaxy had been the first mario game, everyone would still love it, it's a good game, it doesn't need mario to make it a good game. and, as creepy as it sounds, some people LIKE the new sonic games. there are some people, who sit and write fan fiction dipicting shadow penetrating cream. there are thousands of these people, and they are keeping sega from making sonic 4. whats the point? they are still making money. the point is, a game is a game, regardless of what has come before it.