Wow, your first Smash Bros game? You've missed out. I'd recommend trying the others as well (at least Melee and Brawl). Personally, even with the new game here, I feel that Melee had the best gameplay. The problem lies in that it had a lacking roster. Brawl had a great roster, but its gameplay wasn't as great IMO. Sm4sh seems to have a nice balance in-between the two; it has great gameplay and a great roster.
This, go back and play Melee. You won't be sorry you did. Welcome to the Smash community though!
Side note: I'm saving my "Not as good as Melee" reactions for a few years down the road. Melee had about decade of Tech skill developing, most of which weren't found until the major competitive stuff shown in the documentary that made it that fun. Now people are judging a brand new game by comparing it to a game that really came into its own not even 4 years ago.
Yeah well i never owned nintendo consoles. Only had game boy advance and now a 3ds xl. But i'll be sure to try the older smash games whenever i get the chance. Thanks guys!