It's fine man, lots of trolls and ignorant people on these forums. Concealment OPs are a bit of a one trick pony, and you got hit with that trick. They actually used to be a lot more lethal but have been nerfed a bit. Even in 50 pvp with WH gear you can get unlucky and they'll crit you to death inside a stun, bad when your CC breaker is on CD. But yeah obviously he has 30 more talent points specced into stuff to do more damage, better gear etc too.