The absolute first thing you'll notice about this game is how it surpasses all PlayStation 2 gaming graphics (yes, all of them!). The backgrounds are real, three dimensional places, rather then being several different backgrounds that shift to give it a three dimensional feeling.
The second thing you'll notice is that this game is HUGE. It has nearly four times more than its N64 counterpart, especially when it comes to characters.
The third thing you'll find is that all the characters generally have the same moves. Almost nothing has changed, although some characters have new moves that are more powerful than their old ones.
The music is excellent! You will not believe how good the orchestrated musical remixes are of Super Mario Bros., Super Mario 64, Star Fox, Star Fox 64, and Kirby's All-Star. Nor will you believe how well the guitar remixes sound of Metroid, F-Zero, and more! If there is a soundtrack, it is a must have.
The only disappointing thing about this game is the frustration factor. Near-impossible enemies at level nine seem to "cheese" more than fight. Their attacks overpower your "smash" attacks, which we know should not happen.
Besides that, this is one of Nintendo's BEST EVER and a game for all to enjoy! It's violent to a point. Instead of knocking out your opponent or even killing him, you must only knock them off the battlefield.
So it's obvious. Get the game if you loved the original Super Smash Bros.! You'll hardly be disappointed.