QBs historically struggle in their first season with a new team (not always, Manning being a very good example of this, but it's uncommon enough to be referred to as an exception.), and given the circumstances around Carr (not great OLine, lack of chemistry with super young WRs, non-existent run game, iffy playcalling, etc.), I think it's only fair to give him another season before coming to a strong conclusion on his play with the Saints thus far.
If Stafford can look as good as he has with a QB-friendly system, then I think Carr can be just as good - if not slightly better. Hinges on it being the correct system though, of course.