It is actually a good idea to buy something that is underpowered, as it will likely be buffed in the future. Buying something overpowered at the height of its popularity is a bad idea because it will likely be nerfed.
Tell that to my friend who had the enforcer modified for the vanguard since launch. that's one year of useless suckage.
But just think of how SOE will overbuff. I bet they'll make it able to fire shieldbreaching nukes at enemy warpgates.