Yea if you count sitting in a corner doing 1k damage per gcd while getting deflected all time having ZERO objective score and contirubting to nothing!
Nah this goes away. You need to understand that, the difference between a level 11 in warzones and a level 49 in warzones is *LESS* than the difference between an ungeared 50 and a fully high end geared 50. It's really quite surprising exactly HOW much difference there is but the more epic gear you get the more absolutely devasting your DPS becomes.
EDITED TO ADD:
My damage personally has gone up over 30% since I've been gearing and my HP by 20%. If you think expertise is a big deal that's only part of the equation.