Good guide for the basics of how to play Link, Skler. You've done a great job summarizing the most important concepts required to win against character types, which is something all people who aspire to play competitively should know.
Fortunately, the basics of how to play Link have stayed pretty much the same throughout all the iterations of the SSB series. Anyone that's played him from one game to the next has carried over a minimal amount of basic tactics, and I'm afraid he's far more reliant on his projectiles now than in either of the previous two games.
Even if people say your guide is negative, I feel it's a lot more down to earth than most of the other topics here. As Link, people have ALWAYS had to seriously consider the thought of losing. He always has to work really hard to get kills, though he's definitely had some undeserved nerfing from Melee to Brawl. He's still playable, and all competitive Link players have always understood that they need to work for their kills, it only applies more so now than ever before.
I don't main Link anymore, I made that decision long before Brawl was released, but whenever I saw updates about Link, or little bits of footage, I felt a part of me die as I saw some changes being made to the game in general and to him specifically that really toned him down a few notches. I still play him, as he's pretty much a secondary/tertiary character for me (I've played him so long that he still feels natural with all the changes).
I have to say, there is at least one good thing that he got in Brawl, imho. In general, his ground moves seem to be better (whether in speed, priority, damage or knockback).
It doesn't justify all the horrible things they've done to him, but I think he's still playable as I still use him, just not as my main.
EDIT: Just to add one more thing. I think playing a character like Link is a very valuable experience to many players. A character so dependent upon stage control and spacing really helps give you a different look at the game than just playing a character that has good range and priority on their melee attacks. It'll help you regardless of what character you play.
Anyone that sticks with him as a main for tournaments has my utmost respect, and my best wishes.