I've been browsing this site called American Soccer Analysis that posts a ton of advanced stats on MLS.
So I checked out their goalkeeper expected goals allowed vs. actual goals allowed.
These were the top goalies in the league, and the highlighted # represents how many goals they saved their team vs. an average goalie. Turner saved the Revs over 8 goals for the season.
Now for the worst goalies in the league. Rata might want to look away. We all knew Evan Bush was awful, but just how awful? He cost the Impact OVER 10 goals last season. Not sure which is more pathetic, those stats, or the fact that the Impact kept giving an awful goalie so many chances. Thank god Henry is a genius.
Now for some Vela data. Just how good is he compared to the rest of the league? The column on the far right is expected goals and assists for the entire season (34 games). Vela is at over 1 xG+xA per game, Zlatan put up pretty good #s and Josef was also good. You might notice that #9 on the list, Carlos Gil, has less than HALF the production of Vela. That means there were only 7 other players in the league even half as productive as Vela lol. And 1 of them was Vela's teammate.
Zlatan and Josef are now gone, but I suspect there will be a few more players closer to Vela's #s with the influx of talent this offseason.