It's about how consistent the goalies perform. I usually always put it at 2/2. If you put it at 0/2, the goalie will have a good game, then a really bad one, then average etc. At 2/2, it's more constistent but it still depends on his ratings.
Lots of uncertainty surrounding this from all over the internet.
In ea 18 I edited the star goalies to a level 2 consistency and after simulating a few seasons I noticed their stats were all sorts of terrible. Allowing 4-6 goals a game.
So next franchise I edited the goalies to have a 0 consistency. After a few seasons into the franchise the goalies would have a bunch of shutouts a season (like 20 something) but then have games where they allowed 6-8 goals so their stats were still average.
Then I tried a 1 consistency with star goalies and that seemed to be the most stable. Star goalies had 8-10 shutouts and around a 930 save %. Completely defying a lot of suggestions online.
One thing that supports that 0 is best is that EA has every NHL goalie at a 1 consistency except for Holtby, he's rated a 0 as the Stanley Cup champion goalie.
I'm so confused. I wish I could get some clarification from EA. Unless they have posted something and I just can't find it.