Good posts, SonicRetard. I still disagree of course.
I love platformers myself, but let me reiterate that there's nothing on the SMS that comes close to Super Mario Bros 3, Mega Man 2, or Contra in terms of speed, fluency, tight control, and overall experience.
And as a lover of sports games, Sega's hilariously-named "Great" series lags way behind the best titles on NES (Tecmo Bowl, Baseball Stars, Blades of Steel, etc).
I will admit my opinion is based solely on my impressions of NTSC games, as I haven't looked into imports for either system.
And I do agree with aaron - the Master System always feels "slow" to me. I don't know how much of this is real or imagined, or how much has to do with game design or actual hardware limitations.
That said, I do love the SMS and I'm slowly building a modest collection of games. While I vastly prefer the NES, I'll take of the SMS over any other 8-bit system or computer.