I'm no expert but I just have to disagree with this assessment on tight ends. It seems like all the good teams in today's NFL have an above average tight end. Gronkowski and Hernandez set the world on fire as mid range targets after Moss left New England. The Saints immediately got better toward the end of the season once Graham started contributing in the red zone.
At the best, a good pass catching tight end can be a major contributor. At the least, he can be a nice safety valve. At the moment, we have neither.