This luigi is much better than the melee one, and possibly the best one yet. His appearence is a bit weird, and his voice is a bit ********, but those are minor things. Brawl is quite floaty, so by comparison he's pretty fast. His Up B is incredibly useful (like it was in SSB) and kills at relatively low %'s (85% +). His Up B, like the other 2 versions of him, can be setup by Nairs, jab, 2 jabs, but now they added Dtilt (Dtilt trips opponents, which can catch them off guard and u get a free Up B).
I hate how they added him falling on his head at the end of the move, and the fact that he falls so slowly afterwards. He's much harder to kill due to auto sweetspotting, and because his recovery is much better (mainly due to his Down B) he can edge guard a lot better. In ssbm, Luigi was an overall poorly constructed character who had "gimp me" written all over him. The frames where he pulls his head out of the walls when u missile into it too closely is absolutely hilarious and adds to Luigi's fun personality.
The green missile in itself isn't that bad, but the misfire sucks by comparison. Why they messed with it i'll never know. Calling Luigi the Dan of smash bros. is a ridiculous insult haha Dan is a useless character, and Luigi is far from that. His aerials were nerfed overall, except for his Nair and Bair. His Diar is harder to spike with and doesn't kill for a long time. His Fair used to b so much fun to kill with, but those days are basically over. His smashes are still awesome, he combos incredibly well and has good spot dodges/rolls.
He's an improvement overall, and will be a potential threat in the tournament scene.