There is no escape. @ Wild Hunt warrior
But speaking on topic - most of the explanation about Gezras has already been done before me, so I'll try to be brief.
Gezras is to a certain extent "build around it" card, so if you have no counters for your opponents' plan it will feel OP when you lose to it. However, decks with him are susceptible to bleed and the more units you destroy, the less of a threat he becomes; there is also the possibility of making Gezras stay on less populated row and thus minimize his effect (which is how I won a match with my all-in elf Eldain against Eldain with Gezras despite getting my scenario destroyed and opponents' being fully procked).
In short: is Gezras a strong card? Most definetely. Is he OP? Depends on the in-game situation.