I don't even know who fits in the worst Saints QB list. You've got the lovable losers--very competent QBs who don't rise above the competent level. Bobby Hebert, Aaron Brooks, Taysom Hill (not really a QB) all fit here for me.
Then there's the Billy Joes (Tolbert and Tolliver). You can throw Bobby in there as well, but what an era this was. (also, Billy Kilmer, Bobby Scott, Bobby Douglass, I never watched them play).
You've got the one-last-paycheck squad. Kenny Stabler, Jim (not Chris) Everett, Mark Brunell all come to mind.
You've got the Uncle Ricos... Steve Walsh, John Fourcade, Danny Wuerffel, Heath Schuler (also fits above list).
Guys you aren't sure what to think but maybe you like or don't like them but really they aren't good NFL QBs: Jeff Blake, Jameis Winston, Teddy B, Jake Delhomme, Derek Carr, Kerry (Tom) Collins.
So maybe we've had 4 competent QBs in the entire franchise history? And that's a stretch in part because I have no idea if Archie Manning was actually good or just father to 2 very good NFL QB sons. So it's Drew, Bobby, Aaron, Archie... ?