@ Broken Heart at Dusk
Those fighting games area all traditional fighting games. Smash is far from traditional. Smash is also not like those games, even the crossover fighting games, because it includes elements of various 2D side scrolling Nintendo games (most noticeably platformers).
Trust me, the next 2 smash games will sell like hot cakes. Most people have mentally categorized smash in it's own little category.
Plus, Smash Bros' rivals (PlayStation All-Stars, TMNT Smash, that Cartoon Network fighting game) is all just (trash) copies of it that don't compare to it.
It's like trying to compare Gran Turismo to your redneck 4 year old cousin racing drunken hamsters!