It's not... bad. But it's not... good? I dunno, I can't describe it. It feels like smash Bros... but also doesn't. :/ I'd suggest waiting until Smash gets announced, but if you REALLY wanna try it, go ahead.
I bought it and played it for like 2 hours before I just turned on my Wii U to play Smash 4. If you have access to the real thing don't bother. It didn't scratch the itch for me, and playing it just made me want to play the real Smash Bros