May has taken a position - we are leaving no matter if we get a good deal, a bad deal or (worse) no deal. Corbin has taken a position that we will take a deal no matter what we are given.
Neither is the best decision, but doe to not wanting to go back on the leave decision, no matter the consequences both have boxed themselves into a corner.
If you criticise Corbybs decision to announce he will take a deal whatever then the same criticism needs to be levelled at May for her open stance.
not really - given that we are leaving then accepting a deal at any cost is fine to criticise without having to criticise the other... you don't need to create an equivalence every time someone criticises something.