What is the best Mario game, ever?

Game Daily published a feature last week dubbed The Top 10 Mario Games. Super Mario Bros. 3 took the top spot amongst a slew of greats.

While I may agree with their first pick (either that or Super Mario World in my book), I disagree with several others; Mario and Luigi: Superstar Saga at number four? Seems high to me.

In your eyes, what is the best Mario game to date and why? Post in the comments, folks.