I got Smash Bros. on Wii U, but not 3DS. 
lucky you, you have superior version
with the NX on the way i'm reluctant to buy a Wii U now
A few more minutes of updating, then we can get a little one-on-one time
Yeah I still consider ZSS my best but I know my Lucina isn't too bad either. I was really rusty with Robin though, and I need to practice Sheik even though I didn't use her. Keep in mind I don't have any DLC fighters just yet either so I haven't tried things like Roy or Cloud. I also want to try Bayo but I'd rather wait until she inevitably gets nerfed.
But yeah I had to stop because Smash gets my adrenaline pumping hard and I need to cool down after a while. But it's not as bad as say having a few bullhit runs in Smash Run or anything, it's just something I noticed.
Yeah Bayonetta is INSANE right now. She's gonna have to get nerfed otherwise the competitive meta is [tornado fang]'d.
Cloud is... Dare I say it... Decent. He was pretty OP on release but got balanced and he's fine now. All around good character. Roy's my second main after Lucina and he's also pretty solid, but he's considered low-tier.
Only advice I ever give for Robin is that you can jump and you can use the sword. Lotta people forget that.
Shiek was OP until last patch when she got annihilated with nerfs haha.
I tend to get heated when playing online but with friends it's kind of relaxing. It's a weird dynamic. Smash Run is infuriating though, I agree.