Anther's isn't For Glory. The site lets you know where every player is located, so as long as you stick with playing people near you your lag shouldn't be an issue very often. Assuming you have good internet yourself. Also people from my experience usually won't go on there if they have a laggy connection, unlike For Glory where people don't care. Remember, online smash 4 is peer to peer so lag is completely dependent on the connection quality of the two people that are playing each other. The vast majority of my matches on there have had no noticeable lag. I'd say yes.
Also, invest in an ethernet adapter for your wii u if you don't have one already. Having a wired connection instead of a wireless one helps a lot with lag in my experience.