Megaman 2 was one of the first games I ever played, I've since played the rest of the nes ones as well as finishing 9, X1 and coming damn far on X2, X3 and 7. Haven't gotten around to try any others in the X series yet. After 10 I'll probably go for 8.

I enjoy the classic series more, but X1, 2 and 3 are pretty damn good too.