I'm to the mansion scenario just before the final stage.

Holy shit, with the help of the Danger Room I totally overpowered Colossus. I took down Dark Pyro and Dark Blob in a single Titanic Legend each (my teammates had actually walloped on Dark Blob a little bit, but it still knocked off the remaining 4/5 of his health. Take into mind he's supposed to put on a shield every 1/5 of his health you take off, making you drop him and go smash a lit statue. Colossus' attack was so devestating it skipped over all the other shield uses and put him straight on the floor), and was knocking around Sentinel Advances like dolls.

I'm finding some characters work well together, and some don't. Storm and Colossus work well together. If Storm Lightnings an enemy it stuns them, so Colossus can waltz on over and Smash them without fear of them dodging. Jean Gray and Colossus don't work together at all. Jean Gray's Psychic Scream and its upgrades send enemies flying, and as a result tends to knock the target out of the way before Colossus can smash it.

A short rundown of my opinions of the characters:

Love Wolverine, Nightcrawler, Gambit, and Colossus both as characters and fighters. Not a huge fan of Cyclops and Storm as characters, but love them as fighters. I love Iceman as a character (yes, I'm willing to forgive the snot thing in that comic) but I find him to be a crummy fighter. Similar scenario with Beast, but he seems to be able to fight, I just don't use him because everything he does Colossus and Wolverine do better. Everyone else can go to hell, especially Magma, Rogue, Jubilee, and most of all Emma Frost.