No, it is not useless.

The PvP gear is better itemized (all left side pieces have only crit/det/speed) for damage than most PvE gear.

Morale gives each stat a bonus equal to the difference between the items based ilevel's stat caps and the new effective ilevel's stat caps in PvP areas. This bonus is given before syncing happens.

Ilevelsync caps the stat bonus received from a piece of gear to that of the synced ilevel. If the stat is under the cap it is unaffected.

What this means is that a piece needs have an effective ilevel of i190 or higher to ensure that all stats are capped in Sealed Rock (Seize). i180 PvP gear has an effective ilevel of i210 making it so that all stats are capped in i150 sync PvP.

In 3.1, when the revised Wolf's Den is released the i180 PvP gear will be BiS/Near BiS.