Papercut
Jermaine Jenas
All great but you do understand factors when you quote stats don't you?
Examples:
How many games played
The opposition and their form
The players available/unavailable
How settled players are (new, etc)
Injuries
Luck!
So many factors that their is no way to predict a game and as such - have a conclusion from stats.
Even with trophy wins you cannot judge a manager.
If one manager is 100% and the other 0% after a season then you can judge a manager!