ret is a 2nd rate dps class, you wont be able to compete with the pure dps classes on the meters. best you can hope for is middle of the pact. if you want to excell at dps, pick a hunter/lock/mage/rogue/fury.
ret does less pve dps than rogues, fury, and even cat spec'd feral. in short. they are the lowest melee dps spec
paladins are one of the strongest if not THE strongest healers in the game. play the class to its strengths.
being the most defensive class in the game comes at a cost.