Obryn
Hero
Wanted to kinda necro this thread for a second. 
The PC with Enter the Crucible broke it out again last night, and it pretty much made him immune to these specific enemies.
However.
They just stopped attacking him. Defender he may be, but his lockdown ability has been stymied against 4 artillery and 5 skirmishers. Instead, the two strikers are on their second failed death save, the Warlord is out of even his worst heals, the Psion is out of power points & dailies, and the Berserker himself is stuck in Defender mode because he doesn't have any Primal Attack powers to burn and he can't get bloodied to trigger his Wrath himself. But hey, he has a lot of hit points left!
So no, it does not ruin encounters - you just have to go against everyone else.
-O

The PC with Enter the Crucible broke it out again last night, and it pretty much made him immune to these specific enemies.
However.
They just stopped attacking him. Defender he may be, but his lockdown ability has been stymied against 4 artillery and 5 skirmishers. Instead, the two strikers are on their second failed death save, the Warlord is out of even his worst heals, the Psion is out of power points & dailies, and the Berserker himself is stuck in Defender mode because he doesn't have any Primal Attack powers to burn and he can't get bloodied to trigger his Wrath himself. But hey, he has a lot of hit points left!

So no, it does not ruin encounters - you just have to go against everyone else.

-O