This is a vast understatement of the dynamics of traditional fighters. Good ones (i.e. not Killer Instinct) contain all the spacing (players call it "zoning") and mindgame elements of the smash series. Go to SRK forums and post this, see what they say. I'm sure since they actually play these games they'll do a much better job explaining it to you.
I play these games as well, and have placed top 3 in Street Fighter tournaments and have stayed the night with some of the world's best GG and SF2 players all in the same house, playing traditional fighters all night. I
beat some people that had been playing Guilty Gear for years by picking up Eddie and Sol Bad Guy and copying all the combos they did. It's mostly muscle memory.
That's bull****. There is not one thing you can possibly do in Brawl that takes as much practice to pull of consistently as nair to thunder's combo into a perfect chaingrab to upsmash. It may be "set in stone" but that doesn't mean just anybody can do it on their first try. The same cannot be said of anything that's actually useful in Brawl.
The skill of playing melee does not lie entirely or even mostly in combos. You of all people should know this seeing as you never really played technical to begin with. Among the things Brawl lacks or horribly simplifies there is also tech-chasing, true shield pressure, crouch-cancel mixups, and especially edgeguarding and recovery games.
Melee takes more skill because you can be truly punished. If you make one wrong choice it can cost you large amounts of damage, if not an entire stock. It demands more consistency both in technical ability and decision-making capacity.
Melee: You make 1 mistake and you're dead.
Translation: You punish one mistake and you win.
Brawl: You make a dozen mistakes and you're dead.
Translation: You have to punish effectively at least a dozen mistakes to win the match, and you must do this consistently.
To put it in perspective for you:
People trained on
level one computers in Melee to get better and saw impressive results by doing so.
People never train on computers at all in Brawl, because it is worthless save for learning technical things like IC chain grabs. You need a human opponent to practice, because it is a mental game with a million more variables.
The skill of playing melee does not lie entirely or even mostly in combos. You of all people should know this seeing as you never really played technical to begin with. Among the things Brawl lacks or horribly simplifies there is also tech-chasing, true shield pressure, crouch-cancel mixups, and especially edgeguarding and recovery games.
All of this is in Brawl.... and edgeguarding is no longer "I hit you with one move", but more "I hit you with several moves repeatedly, calling you every time and forcing you into bad positions where I can intercept".
In Brawl you can get by "most players" by spamming spot-dodges. Take away Metaknight and you can probably get even further.
This isn't true in the slightest, except the MK one. >_>
Melee's fun and all, and I really enjoy the game.... but it was a muscle memory game. The thing that made smash so amazing when I first started playing it was that there were no "set combos" and you had REALLY get good to learn to follow people's DI. Then I realized there WERE set combos, and I repeated those ad infinitum just like everyone else.
It takes more skill to play Roy effectively in Brawl than it does to play Marth.
Every character in Brawl is Roy.