The club length the large "name brand" manufacturers use on their clubs is TOO long for 90% of men golfers and 98% of women golfers. These large companies make drivers that are 45½" to 46½" where as the average length of drivers used by Tour Professionals is 44½".
So why is this done? Because, companies advertise that the longer the length is, the longer you will hit the ball. Except it only works when you have smooth tempo, a consistent square swing path, a LATE RELEASE OF YOUR WRIST-COCK ANGLE (notice it is capitalized...must be important), good swing timing and rhythm.
If this isn't you, it's not going to work.
This chart gives a good starting point when considering what length will work best.