The whole point of a Consume is to be used, not like if you save it until the end of the round you get a bonus for not using it...
By that logic you would have to wonder why people do not use Harpie Egg, I mean come on it is a "free" 8 for 5 and here people complained about other 8 for 5s when Harpie Egg has always existed.
Consumes are not free, of course you want to use them, however you always expect the Consume itself to give you a certain value (which in an analysis you also have to (in part) allocate to the consume itself and the usual result is 1-2) and by your estimation OH would be worth 6 points as the Consumes would not have any value assigned to them, on that front one would wonder why people do not complain about OH not getting buffed.
Edit: For Consume decks he is also a +1str/+1provision version of Caldwell, which is completely unusable without an immediate Consume (so for that purpose I would say Berengar is actually an inferior Caldwell).
MO aside, in a witcher deck Berengar is almost unconditional 9. He's bad only if you draw him and no other witchers in a short round - so more RNG.
I think he would be much better and more interactive, if instead of just beeing a tall unit, he boosted himself for every adjacent witcher and reseted at the end of your turn if he wasn't adjacent to a witcher.
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Agreed, I would also have prefered a
slightly more restricted ceiling and much higher floor, being less of an "All or nothing" type of card (which is kind of binary).