If you knew anything about the Red Sox system you would know that the Portland team was empty of any talent. Up until recently they didn't have one single guy who projects as a MLB starter. You also do realize that there are multiple levels of minor league baseball? AAA, AA, high A, low A, short season A, rookie leagues and Dominican summer leagues? Taken the weakest team of 8 in the system and using that as an indictment of the system as a whole seems a bit biased to me.
Yes the top of the system is weak, but that's because in recent years they've graduated Bogaerts, Betts, Swihart, JBJ, Barnes, Wright, Shaw, Vasquez. No team, not even those with some of this decades best farm systems have elite talent at all levels, that is virtually unheard of. I see a very nice wave of talent coming up behind our recent graduates....who by the way were called by many Sox fans grossly overrated and busts because they had an adjustment period at the MLB level.