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The 2019 NFL season has certainly been full of surprises.

More than a month in, only two teams are 5-0, while four others remain winless. Several star players—including quarterbacks Ben Roethlisberger, Drew Brees, Cam Newton and Nick Foles—are out with injuries. The rise of players like Kyle Allen and Teddy Bridgewater has ensured that not all of these injuries are derailing campaigns.

With surprise often comes disappointment, and each team has endured its fair share through the first five weeks. Whether it's an underwhelming player, a struggling unit or simply a failure to meet expectations, even the top teams have something to be disappointed about.

Let's take a look at what, exactly those biggest disappointments are.