I don't know what you mean by legit, but I guess they have a better team than anyone expected.
The win against Detroit was well....a loss
In the win against Dallas Chicago came away with 3 turnovers and only won by a score. That game was more about what Dallas didn't do than what Chicago did.
Green Bay had what 18 penalties last night? The Packers more or less beat themselves.
All that said, a win is a win, and I'm sure the Bears and their fans are plenty satisfied with where they are at for now, although I wouldn't hang my hat on it.