In a world of ridiculously overpowered characters, some just aren't AS overpowered as others. That doesn't mean they aren't great, they just aren't AS great. So, yeah, while Link is certainly a great character by vBrawl standards, you need to remember that since 3 of his 4 specials are projectiles, they can be reflected / shielded, potentially putting Link more at risk than his opponent. Most of his Smash attacks are somewhat slow, his running speed is only average, if not lower, and he's overall just kinda slow. When looking at characters who can auto-cancel moves, set up nice combos, and so on, Link's just somewhat behind in the tier list. If you look at Toon Link, they compliment themselves very well. Toon Link set's up traps, hit's with a barrage of light attacks, and performs combos. Link, on the other hand, is more of a heavy-hitting character, being able to kill early with a grounded Up-B, hitting a couple good arrows, etc. That being said, a large part of Minus is the combo game, an aspect that Link is trailing in. Again, I'm not saying he's bad, I'm just saying he's not as good as the characters higher up on the tier list than him.