People seem to have a little confusion when it comes to tiers and tier match ups. Not to mention some confusion on Luigi's placement.
Honestly speaking from a competitive aspect, Luigi is low for many reasons: He's got insanely low friction, so he slides all over the place and it's hard to shield grab with him; missile recovery is quite easy to gimp; large short hop and terrible dash attack combined with how floaty he is makes his SHFF'ing/ground game a little punishable; unorthodox spike; etc etc etc (SOME of these give him advantages, IE low friction gives him a sliding usmash and whatnot, but more disadvantages than advantage).
Another thing I believe is that, I have to disagree with what LOTS of Luigi players say in his defense, that he's, "too difficult to use, that's why people skip him." Quite the contrary really, with his high priority, great recovery, fast/strong aerials, and an up B that kills earrrrly (Not to mention notably easier to hit with in Brawl) Luigi is a very user friendly character. Go pop in Melee, Luigi's recovery is hella tough compared to Brawl (Difficult rising 'nado, VERY little to no DI with the up B after you come down), and his up B is a little more precise back than.
Eh, sorry to digress like that. Annnnyways, back on track. No, I don't agree that Luigi can win tournies. Luigi players win tournies. Yeah, yeah, if you want to get technical this goes for every character, but I just want to emphasize this on the Luigi boards, since I believe that the Luigi vs Metaknight match up is a tough one for him specifically (Don't worry, you have great chances against Snake in terms of character match up).
Brawl is NOT tech heavy, regardless if anyone of us would like it to be, but I think most of us have gathered by now. I don't honestly believe that Luigi at the moment has too many advanced techs, so I always have a chuckle to myself when I read/hear about other Luigi players talk about their tricks or whatnot with Luigi.
I'm not saying you don't need to practice him and just run around roflstomping people--but rather, I think it's simply all basics for Luigi once you learn things to do with fireballs, how to set up those up B kills, etc. I'll stop myself here so I don't repeat my other thread in this post.
My best advice I could try to imply in this entire post of mine is that Luigi will NOT win tournies, the Luigi players will. Unless someone finds a USEFUL and STRONG (Read: useful and strong) advanced technique with Luigi, then it allllll relies on the ability of the players mental game over his physical game nowadays.
Luigis will not run amuck slapping MK's and Snakes with super unstoppable combos or glitches, they will out space when the time is right, out prioritize when they know they can, use the RIGHT dodge when they should, and just simply out think the person next to you, that's trying to make you trip over your own brain so to speak.
I've got a great example if I may...I've been going to Reggie's/Rejk's local tournies since his first one waaay back in March. The VERY first local tourny he held, I placed second only losing to a Marth player, Nightside, while (As usual) I used Luigi the whole tourny. The guy's just too good at reading dodges, and punishing you for everything you do.
So, along rolls around Reggie's second local tourny, and voila. I beat him out this time around, 2-0 in our set. And I'll tell you something---I didn't learn a **** thing in terms of new techs, new combos, or some abused combination of moves. No, I won that fight that night, because I didn't trip over my own game. I spaced ten times better than the last set, I READ multiple dodges and up B'd him out of them, I did completely different set ups for every up B I attempted to keep it fresh, and I threw out nairs when I was caught in that forward B sword trap this time around because I knew it could get it out to stop it. I played MY game, to the extent of out thinking the thinker.
I think I played, maybe 3 different people between the first and second tourny? It's not tech savvy, training hard to time those "buttons presses," it's bending your brain to watch yourself, and more importantly watch your opponent.
Do, not, fight, him. Make him fight himself.
That's how Luigi players will win tournies.
~The Greench