When you see 2013 in the middle of those ugly years, what do you see? Do not take me wrong. I don't want to take away credit to anybody but to me the stars aligned that year. Most of the key players posted their best career numbers that year. Look at Koji, just for mention one.
For every failure you will find excuses, conjectures, etc. but the fact is that this team has been run and managed very poorly... that sk, is and has been the main problem in this team.
Said that, I always have seen in Porcello an untalented/mediocre(at best) pitcher, and his "youth" is not magically give him the talent that he never has had.