His Up B Sucks. Proven point. And yes, parading onto the site as a new member talking crap about how good you are without any merit nor anyone to vouch for your claims does make you a n00b.Pros
Up B has high K.O ability
Every special move but Fireball can be used for recovery
One of the two fighters with a taunt that can damage an opponent
Attacks have no lag
Up B can do only 1 damage if not done right next to the opponent
Up B leaves Luigi open when he lands
Low priority attacks
Slides along surfaces while turning in a dash
Luigi is best in Free For Alls where he has room to breath. He doesn't cope well on flat stages like Final Destination or Battlefield.
Use his Fireballs to rack up quick damage and when surrounded use his tornado move. When you are launched off the stage do not jump. Charge up your luigi missile (Side Special) and launch when you line up with the edge. If you do not make it, you can then double jump and also use his coin jump.
You don't need to be cautious of recoverys, plus he is one of the few characters that can go all the way around final destination
EDIT: @ Shadow: I didnt say Roy wasnt good, just that Jiggly deserved a spot more than he did.