Parity.

One of the more important words in the NFL lexicon.

The league outwardly starts that parity between all teams - whether they're a small or large market franchise - is one of the most important facets to the overall success of its product.

For that to be the case; it would mean that you would have to see plenty of upsets from time to time, showing that on their day, any side is capable of shocking a fancied opponent.

Well if that's the case, its safe to say the NFL has parity, especially in light of the raft of upsets that littered week three play.

The Oakland Raiders topped the New York Jets - one of the AFC heavyweights, Tampa Bay Buccaneers pillaged a victory from the Atlanta Falcons, Seattle beat Arizona in the battle of the birds, and the New York Football Giants capitalized on a nightmarish performance from the Philadelphia Eagles - the self-dubbed ‘dream team' of 2011.

But the Buffalo Bills arguably produced the single greatest upset, not only of the round, but in recent years.

The Bills surged from 21-points down to topple the New England Patriots, with a Rian Lindell field goal sealing the deal as time expired.

Buffalo have spent much of their recent history languishing around the depths of the AFC East, with their struggles magnified by the fact they've been something of a whipping boy in one of the toughest divisions the league has to offer.

Yet after their win today, the Bills sit undefeated after three weeks, something that even the most fanatical Bills supporter would have thought was far fetched.

Besides the win, the way in which the Bills were able to shut down New England's ‘golden-boy' quarterback, Tom Brady, was the most impressive element in their win.

Although Brady still threw for 387 yards and four touchdowns, he also completed four passes to the wrong team, with Buffalo intercepting Brady on four occasions.

If Buffalo can maintain their offensive prowess, and continue to force turnovers on defense, they could be a legitimate threat in 2011.

BALTIMORE BOUNCE BACK FROM WEEK TWO APPARATION

After stumbling to defeat against Tennessee last week, Baltimore showed how good they could be this year, making a mockery of a subpar St Louis Rams side.

The Ravens ever-present defense shone thrown again, holding the Rams to just 244 yards, while forcing 2 turnovers and sacking quarterback Sam Bradford five times.

But it's the emergence of an explosive offense that could push the Ravens to the next level this season.

Baltimore set a franchise record, producing 553 yards on offense, led by the often-maligned Joe Flacco.

After three weeks, the only obstacle that appears to be standing in the way of success for Baltimore this season, is inconsistency.

If the Ravens can keep that in check, watch out.

DETROIT CONTINUE TO SHINE

In 1980, Caddyshack, The Shining and Empire Strikes Back captivated box-office audiences, Blondie topped the charts and Malcolm Fraser was Prime Minister.

It was also the last time the Detroit Lions were 3-0.

But it wasn't clean sailing for Detroit, as it took a Jason Hanson overtime field goal to push the Lions over a gallant Minnesota side.

The fighting, come from behind win, was perhaps the biggest sign that this Detroit Lions team isn't like any other that has gone before it.

Staring at a 20-point deficit going into half time, the old Lions would have folded, and things would have only gotten worse after the break.

However, the current Lions weren't willing to go quiet into the night.

Matthew Stafford and Calvin Johnson connected on two-touchdown passes, and were at the heart of Detroit's fight back, with the Lions even taking the lead with two minutes left.

Minnesota would pull level, but in the extra period, the Lions were good enough to take home the victory.

VICK'S BAD BREAK

Philadelphia Eagles' quarterback Mike Vick, entered the clash with New York Giants in doubt due to injury, and ended the game sat on the bench nursing a broken hand.

The day couldn't have gone much worse for the Eagles, as not only was Vick forced to sit out the end of his second-straight game, it ended the same way as the last, with Philadelphia surrendering a lead to fall to another defeat.

All the talk before the season revolved around how good Philadelphia's team of acquired stars could be, yet already that talk may appear premature.

When all their players are on the field, the Eagles look like they have the tools to beat anyone, but their loss to the Giants once again exposed a lack of depth in Philadelphia.

Considering that Mike Vick's style of play means that he is likely to endure more hits than any other quarterback in the league, if he keeps having to watch games from the sideline, it looks like the season won't go quite the way Philadelphia had planned.