NFL 2015: Team-by-team grades

Dec 13, 2015; Charlotte, NC, USA; Carolina Panthers quarterback Cam Newton (1) celebrates after his team scores a touchdown during the second half of the game against the Atlanta Falcons at Bank of America Stadium. Mandatory Credit: Sam Sharpe-USA TODAY Sports
Dec 13, 2015; Charlotte, NC, USA; Carolina Panthers quarterback Cam Newton (1) celebrates after his team scores a touchdown during the second half of the game against the Atlanta Falcons at Bank of America Stadium. Mandatory Credit: Sam Sharpe-USA TODAY Sports
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Dec 6, 2015; Tampa, FL, USA; Tampa Bay Buccaneers running back Charles Sims (34) is congratulated by quarterback Jameis Winston (3) as he ran the ball to the one yard line against the Atlanta Falcons during the second half at Raymond James Stadium. Tampa Bay Buccaneers defeated the Atlanta Falcons 23-19. Mandatory Credit: Kim Klement-USA TODAY Sports
Dec 6, 2015; Tampa, FL, USA; Tampa Bay Buccaneers running back Charles Sims (34) is congratulated by quarterback Jameis Winston (3) as he ran the ball to the one yard line against the Atlanta Falcons during the second half at Raymond James Stadium. Tampa Bay Buccaneers defeated the Atlanta Falcons 23-19. Mandatory Credit: Kim Klement-USA TODAY Sports

Tampa Bay Buccaneers

Grade: B

What went right: Jameis Winston is a winner and a franchise quarterback. Yes, the Buccaneers are going to have another losing season but the campaign was a rousing success for Winston. The former Heisman Trophy winner lit up teams in the second half of the season, throwing for 3,422 yards and 20 touchdowns against only 12 interceptions. Once the offensive line gets better and Winston completely adjusts to the pro game, look out.

What went wrong: The defense continues to be very poor. Head coach Lovie Smith made his bones on the defensive side of the ball with St. Louis Rams and Chicago Bears, but he has really had a tough time putting together a good group. Smith must find ways to scheme with stars like Gerald McCoy and Lavonte David in the front seven. The secondary is the biggest issue, which is simply no good.

Offseason expectations: The front office has to be looking at two areas: the offensive line and secondary. Those two units are costing Tampa Bay on a weekly basis, something that is holding the Buccaneers back from being a real playoff contender. The offense could also use another running back if Doug Martin is not brought back. Martin has been great this season and might cash in elsewhere.

Next: Arizona Cardinals