Really? Smash can only compete when it comes to gameplay, has no story, worst graphics, worst ST and less features, so really, why would is get a better review than GTAV? I personally, as a fighting game player find smash to be a button mashing fest that can't be take seriously, so not even as a fighting game is really a big deal. It is a big deal to Wii/Wii U owners because there are only nintendo games on those consoles.
Well, I have a lot more fun with Smash and play it longer.
And before you criticize, yes I played GTA V and I think it is OK but not great. Smash 3DS has already much more hours of fun. Smash WiiU will probably not worse.