I was always a Franco fan. I don't recall clubhouse politics during his tenure, but I don't doubt it one bit. Leiter never bugged me, either, but I can definitely see how his personality can rub people the wrong way.
When I think of Mets I didn't care for, the two names that immediately come to mind are Tom Glavine and Carlos Beltran. One more recent player would be Syndergaard. I think he really became a loudmouth as.shole during his last couple seasons.