Week 1, according to the new game matchup screen.
The way to look at these ratings is that a 3* is basic functionality at a position. Anything less than 3* means you're going to get consistently exposed.
1* means you're an embarrassment. 0* means you either don't start that position at all, or you must be joking with your roster.
My roster isn't looking too bad! Granted, we're 2* in 4 positions, but the 5* in RB & CB might cover for that. We should get a win against the Phoenix this week.