This is a good site for stats which are adjusted for opponent, games situation etc.
http://www.footballoutsiders.com/stats/teamst
Click on the stats link for a bunch of good stuff.
They rank WR, TE, RB, QB, OFF, DEF, ST, and both Lines.
Here's a summary:
Ertz 8th
McCoy 16th
Maclin 19th
Foles 19th
Sanchez 24th
Matthews 25th
Celek 43rd
Cooper 80th
Total Team Efficiency = 7th, last year they were 8th. (Means stat -wise trhey were 7th best team)
Total Offense = 13th, last year they were 3rd
Total Defense = 10th, last year they were 23rd
Special Teams = 1st, vs 25th last year
Defense = 20th vs pass, 6th vs. rush
Offense = 15th in passing, 13th in rushing.
Off Line = 30th in run blocking, 9th in pass blocking
Def Line = 11th in run defense, 11th vs pass
Couldn't find any stats on CB, S, LB's maybe someone else can find them on the site.