In our local playgroup, we will gentleman to Big Blue and Mute city fairly often. I'm really hype for the new UI in 4.0 although I'm not sure if it's going to be an edit to the old one to remove the white bars on the edge of the screen or if it will be completely new.My two cents: vanilla Brawl and Smash 4 are not good for tournament play, fun as they are. Smash 4 at Apex 2015 was grueling to watch while I was waiting for Melee Top 8. 6 minute matches, most of which went to time with only two stocks, and generally defensive play. It's probably more fun by far to play than spectate. What I was referring to mostly in 3.6 was a better UI, with neutrals and counterpicks being separated more cleanly and some important bugs being fixed. (Skyworld's overhanging clouds, Distant Planet's weird convex ledges, etc.)
Big Blue is definitely going to be a counterpick stage at our weekly tournament though. It's not balanced enough to be a neutral, but it's pretty fun.