Stealth gettting excessive in PvP?
Destroy the stealth gyro.
Scrapper and druid are the two best rezbot in this meta. They are very hard to counter in uncoordinated play.
The best way to counter is probably play a scrapper yourself. The sneak gyro belt skill is a reveal on low cooldown. Combine that with hammer 5 which is 1200 range AOE stun that can prevent rez.