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Without a doubt you have to be aware that CERA, especially in less than a season, could be way misleading.  Yes there are times when a little knowledge is a dangerous thing, and a particular stat can take us in the WRONG direction of understanding.
We're using it to address a macro point, here though:  some people think that Jesus Montero is incompetent as a major league catcher, that he is below critical mass, that his presence behind the plate warps a baseball game.
If that is the question, then it is worth knowing that the other guys have not scored more runs in Montero's games than in Olivo's.  That is one piece of evidence that casts the "incompetent" theory into doubt.
It's like somebody asserting that Nate McMillan was a poor basketball player, and then noting that his plus-minus stat was very good for his career.  It doesn't end the discussion, but you do want to include the fact in the discussion.