Can we admit the experiment is a failure?

Season 1's two relationships aside, I feel like we can no longer claim that this experiment works. Season 2 was a giant sad trombone, and I am skeptical about Season 3's relationships.

Are there certain things that can be added, though, to make it a success? Would adding a couple's therapist, or something, early on in the courtship help make these relationships work? Why is it that arranged marriages have such a great record, but Love is Blind can't measure up with a theoretically better arrangement?