In their class, but not in general.
They are all-season tires. They don't perform as well as winter tires in the winter, and they don't perform as well as summer tires in the summer.
They're also a terribly mushy tire. They feel like you're floating around on the road and wallowing through the turns. This doesn't matter in the slightest to someone commuting to work in their 15 year old Honda Accord with blown struts, but if you enjoy driving they're on the list of tires to avoid.
Everything is a tradeoff. Some tires do a better job of optimizing within their class, but the Michelin CC2 is assuredly not the best traction tires in general.