Skler is right....bombs aren't nearly as good as they were in melee...sad but true.
There's one VERY interesting trick I've learned, though...I came up with this when I saw a snake user (pozer wolf to be exact) grab a dropped 'nade and shield against an upclose attack, then BAYUM the attacker goes flying while snake blocked the blast!
While Link is doin' his projectile spam, pull out a bomb. I advise to do right after u hit a guy in midair from a distance with ur 'rang, considering you're bound to have to catch ur rang anyhow. Or u lose it for like 5 secs. Which pretty much sucks.
Then, keep spamming. Once the guy is all up in ur face, start blocking/dodging. Then, one of three things would happen (if ur bomb is about to 'splode, at least. <--
This is crucial)...
a.) He attacks you, you block, then BOOM he goes flying from the 'splosion. Best case scenario, cuz then u can get away from him and projectile spam a lil more.
b.) He grabs you, then either he is smart and thows you before your bomb goes BOOM or the bomb goes BOOM while he's holding you. Worst case scenario, cuz u take a chunk of damage from both the grab and the bomb.
c.) He chickens out, and doesn't come close enough to you. Then you simply chunk the bomb at him, and it can possibly go off in his face, even if he dodges it. Or if he's above you, just keep blocking, he might still fall for it...no pun intended.
Also effective.
The only thing that would make this better is if Link could hookshot in midair while ur still holding the bomb. That would actually enable him to chunk the bomb after he shanks the enemy with his hookshot, and thusly continue his projectile game. I don't think u can hookshot in midair if ur still holdin a bomb...but maybe u can still hookshot out of an airdodge? I dunno, I guess I'll try when I get back to my Wii. I'll post/edit when I get more det's.
Oh, and ImpactAR, Link isn't worse in Brawl...he's just different. He relies a lot more on defensive tactics than the one in melee already did. Also, he has one of the best projectile games in the...well, game. And have you ever seen Link's new dair in action? It's pure pwnage. Trust me, don't take him lightly in the hands of someone who understands his strengths.
...but take him VERY lightly in the hands of a n00b.
Edit: Oh, just a tip...you can spam like crazy with the gale boomerang, you can spam arrows against most opponents (be cautious about arrows against reflect noobs, however)...but DO NOT simply spam pulling out and chunking bomb after bomb at your opponent. That is the worst mistake you could make, because it is SO much slower and SO much more risky than your arrows and 'rang. It's not that it's worse than standing there, but it is MUCH worse than link's alternatives. Ignorance in this game is not bliss.
Oh, also, if you get the timing of link's bomb's explosions down, you can dodge or airdodge the blast from the bomb. Then i'd have to make another essay of a post to explain what could work out in that situation....cuz i'm that bored, lol.