Smash 4 is cool but on a competitive level it is absolutely garbage.
Please tell me you have SSB4.
Seriously. I just think most people haven't really played 4 that much. Lots of people in this topic who have played it have admitted that they either don't own it or have only played it a couple of times.
I mean, you can't really blame people for putting up Melee as the best one - no one bought a fucking Wii U.
Might also be that Melee actually is the best one. Competitively it is of course. Smash 4 also is good competitively. But Melee is also the better casual game. At least I think it is.
I'm still surprised by how deep the gameplay turned out to be, especially with those exploits like wavedashing.