Regression is fantasy football soothsaying when practiced correctly, but that's the key -- it must be practiced correctly. If a player is expected to score one touchdown but instead scores two, that doesn't mean they're expected to score zero touchdowns the following week. It means they're expected to score, as you might have guessed, one touchdown.
In that sense, regression doesn't necessarily mean a player is bad or even overvalued. It means they've produced differently than they're expected to in the future.
Reversing the earlier example, a player who scores zero touchdowns when expected to score one touchdown should expect regression but in a positive sense.