I hope he is, it will be all the more challenging for me to become the greatest Meta Knight main XD.
I look foreward to challenging you all. Hahahaha. *cough*
Yes, he will be naturally because he is one of the coolest looking characters in Brawl thus far in my opinion, and has a large focus with the SSE, seeing how his Ship is a pivotal aspect.
He will most likely play the on the fence Hero/ villian rival type who joins you in the end, you know the type XD
And by that nature, popular. You know equate it with Protoman, and Shadow The Hedgehog.
That, or just as villianous as he was in Revenge of the Meta Knight.
In any scenario he will be a badass, and this will attract players to him.