There's little that has to be said concerning Arsenal's inclusion in this list.
The Arsenal 'Invincibles' became the first team in English history to remain unbeaten for an entire Premier League campaign, and practically steamrolled their way to the title.
In Thierry Henry they had the best striker in the world, in Patrick Vieira they had a midfield combatant who will go down in history and their style and approach to winning games was of the like that hasn't been seen since.
Comfortably having won the league title with plenty of matches to spare, Arsenal were simply a cut above the rest that year.
Should have done better in the cups, but on their day they were completely unplayable.