Nintendo should change "Prefered Rules" to "Required Rules" and let us choose multiple Options we are OK with.
For example, why can't I select Battlefield AND Final Destination as acceptable Stages? Why can't I tell the Game that I am fine with either 2 or 3 Stocks?
Having to strictly choose a single Option for each category and still getting thrown in 4 Player FFAs is ridiculess, especially since we are now paying for Online.
Edit: I have to give it to Nintendo though, the Netcode seems to be drastically improved. I even had some *fun* 4 Player FFAs without much noticeable lag.
In comparison, during Smash 4 every 4 Player FFA felt like a slideshow. And that was with the same (wired) connection that I am using right now.