The problem with "Good Enough" is that in the end it won't me. The relationship will degrade and eventually fail. I think Adinva's comment on intimacy are so relevant.
The relationship dynamics and feelings you cite are a natural part of any long term relationship. The only way to work through them is too actively communicate about them and change/grow as a couple to meet the others needs.
If either partner is not willing to do this, you are doomed.
