SSE was awesome, I don't know what you guys are smoking. It was not repetitive, the levels changed up and ideas flow differently with each level. The storyline was confusing though, Sakurai should have given an intro description in the instruction manual... that is what was missing.
As for Smash 4
Please fix Sonic to where maybe his spin dash or something does more damage and can kill someone...
Add more characters (Mewtwo, Knuckles, King K. Rool, Krystal, and Megaman)
Add more bosses to SSE and add on to it (Robotnik, King K. Rool, Tatanga, Bowser Jr., Koopalings, Dr. Wiley, anything).
Put enemies from series in it (Where are Ganondorf's minions? Waddle Dees and Kirby villians, Samus villians, etc. Only enemies I really liked where Primids, ROBs, and Mario characters, the rest where dumb looking.)
BTW of course you want to rush it when you first play SSE because you want to get Toon Link and Wolf. I did too. That was Sakurai's mistake. SSE is good if you don't rush it and play it right.
Also finally, please do AI characters for SSE that are on your side, it doesn't look right seeing Link, Mario, Kirby, Yoshi, and Pit run in the cave and then only one or two of them are fighting. Do to them what Tails was in Sonic the Hedgehog 2 and 3.