A handful of NFL teams kick off each season with a 2-0 record, setting or reaffirming high expectations for the rest of the year. Inevitably, most of those hot starts turn into disappointment as roster talent, coaching decisions, injuries or some combination of those factors short-circuit the campaign. However, some squads will build on the early success and emerge Super Bowl frontrunners.

As such, not all undefeated starts are created equal. Here, we look at each one (pending the Lions' Monday Night Football contest against the Giants) and rate them based on the likelihood the team in question can maintain the early success.

Atlanta Falcons

Who they beat: Bears, Packers

The Falcons struggled against the Bears, a team that nearly went scoreless in Week 2. But Atlanta had to replaced prized offensive coordinator Kyle Shanahan with Steve Sarkisian, a transition that requires more time before the high-flying offense of last year returns. And it didn't take long, as evidenced by their showing on Sunday night, when Matt Ryan, Devonta Freeman and company ran roughshod over Green Bay. This team has talent on both sides of the ball. And look to be the class in the messy NFC.

Verdict: Real deal

Baltimore Ravens

Who they beat: Bengals, Browns

An injury-plagued 2016 and the annual onslaught of Joe Flacco jokes reduced the Ravens to afterthoughts by Week 1. That didn't stop the defense from holding opponents to just 10 points through two games, highlighting the breadth of talent the team has across the front-seven. But the lack of a trump card on offense, a season-ending injury for All-Pro guard Marshal Yanda and the lack of a real test so far cast doubt on Baltimore's ability to keep it going.

Verdict: Fake news

Carolina Panthers

Who they beat: 49ers, Bills

Just 19 months have passed since Carolina last played in the Super Bowl and the Panthers have one of the highest point differentials in the NFL (+26). But the team has little to feel excited about. The offense looks lost and could perform even worse with Greg Olsen expected to miss significant time. Carolina hasn't beaten a serious contending team yet, and the schedule includes four road games over the next six weeks.

Verdict: Fake news

Denver Broncos

Who they beat: Chargers, Cowboys

The Broncos' defense doesn't look quite as fearsome as it did either of the last two seasons, though that could change once Derek Wolfe returns. Even so, an offense with Trevor Siemian under center has a limited ceiling, and the possible absence of left tackle Garett Bolles doesn't help matters. Without an all-world defense to cover up the flaws, Denver seems to lack the horses to compete for a title. Their dismantling of Dallas was impressive, though.

Verdict: Still under investigation

Kansas City Chiefs

Who they beat: Patriots, Eagles

While most of the nation pondered whether the Patriots could go undefeated in 2017, the Chiefs found a way to exploit the defending champions' flaws and topple them to open the season. Kansas City's defense brutalized Eagles quarterback Carson Wentz as an encore, sacking him six times and picking him off in the fourth quarter. Simply put, no team has started 2017 more impressively or buried as many doubters as the Chiefs, who have a reasonable remaining schedule despite playing in the AFC West.

Verdict: Real deal

Pittsburgh Steelers

Opponents: Browns, Vikings

The Steelers' offense struggled to produce its customary big plays in the season-opener against Cleveland on the road. However, they quickly flipped the script courtesy of a 26-point outing against the defensively stout Vikings in Pittsburgh. Martavis Bryant looks fairly close to the game-breaking receiver of 2015, and Antonio Brown and remains in the conversation for best wideout in the league. When Le'Veon Bell rounds into form, Pittsburgh should look even more terrifying.

Verdict: Real deal