Overall though I don't find the matchup to be a difficult one, at least for me. This is why I haven't gone into a specific conclusion on a "rating" for the matchup. For now we have been discussing all the Ike's +'s in the matchup but we haven't taken emphasis on what Luigi can do.
What I mean is yes we have said that if Ike spaces properly Luigi will have a hard time to get in range to attack but what happens when Luigi has his range and is able to attack?
Luigi's fine if he can get in. Great combo and jab game as well, and his KOs will come at pretty good %. The problem is getting in and staying in.Luigi has a great combo game on Ike, reasonable KO%, and a projectile to help hinder Ike's spacing. Luigi can even get around Ike's gimping if you recover smart and mix it up a bit. So why 60:40?
This is basically the equivalent of Marth vs Mario. Mario really can't get in or stay in long enough to combo him to hell (which he can since Marth is weak from below where we excel).
He can also reach out and try to Fair us during our recovery and sometimes score a gimp.
Also, our approach game is dampened because Marth is faster than we are and can swat away fireballs as an approach. If we DO happen to get close, Ike's jab...excuse me...Marth's dancing blade knocks us back out just as easily.
It falls back on Mario's defensive game...which is relatively strong with Fludd, FIHL, his awesome OOS options, and retreating fireballs. That's the ONLY reason why we don't get absolutely ***** in the matchup...because rushing the entire time isn't safe vs Mario.
That's definitely not the case with Luigi and Ike. He can practically do whatever he wants if his spacing is on point.
Wow...didn't realize. Mario vs Marth and Luigi vs Ike...
Edit:
You give me this and Luigi's reliable defensive game, and I'll back off. Ussi already addressed why playing patient really isn't counted as a defensive game vs Ike.
EDIT: Or what would be an excellent way for Luigi to approach?