Not really. I had a pretty positive opinion of it from the start, and that hasn't changed. It's nice to see the different modes and all though, and I applaud Nintendo for putting the demo out there so you can try before you buy.
It really does seem similair to Splatoon in certain ways though. Its fresh presentation, interesting concept, fun characters, a bit of a lack of content (10 fighters is really barebones IMO), and free DLC to add to the game. If it end up being anything like Splatoon though, we've got a winner here.