A quick analysis might be in order (though it could be subjective)
1.>Archer, by the time the show got good it had lost most of it's audiance.
2.>Picard, is considered to be more of a diplomat
3.>Kirk, has entered the public conscience
4.>Janeway, fairly recent. Might be on air at the moment
5.>Sisko, DSN is the black sheep of the family. And given it's more static location. Sisko didn't have as much opportunity in earlier season to demonstrate.