Thief may have reduced health and armor to other fighting classes, but there is a few things I can site to support this. . .
The first is the extreme mobility
Forget about stealth for a moment. . .What is your plan to take out a bow thief?
Even with a snare it looks like their teleport is enough to keep them out of reach
Best case scenario they will force you to massively overextend on flat ground
With cliffs and other barriers they might be able to fire on you without retaliation
(good luck trying to spike what you can't catch let alone pressure)
The other thing that is a very big deal is having no recharge on skills
At anytime a thief can pour all of their resources into staying alive
I've already seen examples from the preview videos where a thief is about to die, mashes their self heal, and instantly goes to full health
Is it going to require total shutdown then?
Will the game have a diversion style skill to stop the spam or will we see tactical cheese emerge like a team that chains scorpion wire endlessly till their victim is so far out of range that nothing can save them?
This thread has carried far longer than I had anticipated so for those just coming into it that want a shorter version I make one reply the first and second page, but then don't follow anything else up until page 7. . .
I may edit in some of the key arguments later depending on future information as we receive it