I completely agree with SFP, Link is underrated. Its not like Ganon underrated, just really underrated. Link is not crap, and If you don't take him seriously you are going to have a really hard time.
Link has a few faster moves, wich wil not get him punished so fast.
Those are his Jabs, Up Tilt, Zair, Nair and Bair.
His projectile wall is really hard to get through. The best thing to do is being more aggresive on him, because I don't think were gonna win the spacing fight. But Links jab is an awesome gtfo move, so we can't really be in front of him either.
If you get him in the air, his Dair will kill you at ridicilus percents..
And he will mostly have a bomb, so Gimping him isn't easily.
Link mains have godly DI, mostly the basic:
Angle knocback Upward, Bair Momentum Cancel, Fastfall, Jump To bomb Pull (fastfall bomb Pull). That if he doesn't have a bomb yet.
If we send him perfectly horizontal, he wil use Zair + DI, wich enables him to live till like 300 percent.
Really, Link is not crap.
Take those things in mind when playing him/writing a MU.
Don't really now this MU for ZSS actually.. Ill just play some Links I know and then maybe I can get my opinion on it.