Why are the New York Mets the best major league sports team?

Since the Mets have -

1) have an overall losing record ( 3,885 wins and 4,237 losses)

2) won only two Series titles in their entire history -- the same number as the Chicago Cubs and the Florida Marlins;

3) played in only four such series (1969, 1973, 1986, and 2000) -- fewer than the Phillies;

4) have not made the playoffs in any of the last six seasons;

5) haven't had a winning year in any of the last four seasons;

I'm not certain that your question makes any sense. It's fair to say that they aren't even the best National League team to have ever played in New York.