What does it matter? We have all three Thomas, Bush and Bell. What good does it do to build one up and tear the others down? Do you hope the backs you don't like do poorly and cost the Saints a game just so you can be right about those backs? This isn't directed at the OP, just a question in light of all the running back criticism going on in the forum lately.
Bell is going to need Pierre this season just as both need Reggie. Bell isn't in the shape he needs to be in to carry this team (even he has admitted it), and will surely get injured if we rely on him too much. Same with Pierre, same with Bush. None of these guys are all that durable, so having all three of them to spell each other in different ways is a really good problem to have. Hopefully Hamilton is as good as advertised also, as I'm sure he'll get some playing time too this season.
Bottom line, if they wear Saints' colors on Sunday, I'm rooting for them regardless of their position on the depth chart, how good of a runner they are, where we drafted them, or their salaries. Who Dat!