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Would you believe #1 has been asked like 3 times already?

I can't answer it all, especially the TL questions, but I'll try.
#1
-He's slow. While he has good priority, a lot of his moves are really laggy.
-He's heavy. He can get juggled and CG'd a lot easier. Both those lead to being gimped, which is bad since his recovery is...bad.
#2
-Not very good vertical recovery. By not good I mean horrible. His heaviness makes this aspect worse. His horizontal recovery is decent because his weight/ability to momentum cancel, but a good opponent will know to use moves that screw you over.
#3
- A lot of camping with projectiles. Really, all you have to do is watch any good Link match.
#4
-Dair; A lot slower and does more damage I think.
-No idea on bombs.
-Boomerang; Can draw opponent towards Link.
-No idea on arrows. Seems to me like longer startup time/more powerful for Link.
#5
-A better recovery.
-More of an aggresive game IMO. This'll probably differ between people.
-A bit lighter.
-Pretty much the opposite of anything bad that he has.
That should start you off a bit...need more people to contribute though, I don't know everything about him.