M2W is alright, but it really has only two things going for it that set it apart from other services:

1) It does have some neat domain names, but that isn't something critical when looking for a good email service.
2) The language capabilities. If you have reason to regularly use the translation capabilities of M2W, then that is reason enough to want to use this service. I don't, but I have an account there because of that feature.

My point is that "best" is relative. If something suits your needs, then it is best for you. That doesn't make it best for everyone. To state otherwise with no explanation of why you think it best is, frankly, quite rude.