I strongly disagree, there should be NO changes to the Mon Cal's! They work just fine, besides they aren't supposed to be super-strong. They are outfitted luxury cruisers, not battleships...
The rebel strategy is to outmaneuver the enemy, not overpower the enemy (overpowering is the imperial philosophy).
I have played as the Rebels in FOC and they work perfectly...if you know how to use them effectively.
"You will pay the price for your lack of vision!" - Palpatine