I dont really know if Norfair is a good CP or not. the majority of ICs players will not having any trouble CGing mario on this stage and the only thing that would mess them up is the lava (and this isn't the best way to avoid getting CGed lol). Saying ICs air game is bad is completely ignorant and shows you dont really kow what you're talking about. If Mario gets inside he can combo them but he will have trouble doing this. If you do CP norfair make sure ICs do not maintain control of the bottom platform or you will loose, and watch out for upsmash killing at low percents on the higher platforms.
It
IS a good cp goddangit. They can't CG you here if you don't get grabbed, which isn't that hard on norfair because of the terrain. And they can't chainthrow you for long unless they know how to do the "turn around." But if you do get grabbed it should only be like one or two times on this stage, otherwise... YOU'RE DOING IT WRONG! Basically you should play hard to get, and when they slip up or make themselves vunerable, you swoop in and get them. Platforms on this stage help greatly because of Mario's aerial game (up air barrage, anyone?).
Look at it this way. You're Mario and are much much agile than your opponent. You are on a stage where you can perfectly demonstrate this, because of the way the terrain is. You play hard to get, campy defensive sorta thing when you are above or near the Ice Climbers, and use your agility to your advantage and abuse the ledges. Because of you being above them or out of reach it is very hard for them to land a grab necessary for chainthrowing. So their grab game is basically eliminated from the equation of the matchup. All they have left is a bad air game and an ok ground game i guess.
Mario will be able to rack up a lot of damage if he is on a platform below the foe. And if somehow the Ice Climbers get the platform below you the match isn't over by far at all. All it means is they can abuse their aerials and up smash with little chance of getting hit, and if you SPACE YOURSELF well and predict your opponent it shouldn't be an issue at all. How you get to the Ice climbers if they are below you is by either fireball camping, or if that doesn't work, then you go down yourself cautiously by going to the ledge, then abusing Mario's amazing ledge game to come back up and hit them, or fall from the air cape->d air, or airdodge-> d smash or something like that. You clearly don't understand Mario vs. IC's on Norfair. I know all this because I play on that stage a lot of the time and I have plenty of experience there.
Is that enough to satisfy you or should I go through with a list of all the advantages and things Mario has on Norfair?