So what's the consensus of Super Smash on the 3DS? My kids were interested in it but I've heard that it's just not good to control on a 3DS and wait for the Wii U version. With Pokemon and Persona Q coming decisions will need to be made.
It's pretty fun. The controls are fine. The people complaining are those hardcore tourney types who do L-canceling and wave dashing and have become used to playing Melee on a GC controller for over 10 years, which require a lot of manual dexterity, but techniques that 99.9 percent of the Smash audience won't ever use.
Given your family situation and the fact that you used the plural ''kids'' the Wii U version would make more sense since they can play together sharing one screen.
The 3DS version doesn't have download play, so you'll need to buy multiple copies if they want to play against each other.
There's a demo on the eShop with 5 characters if you want to check it out.