So I guess the question then becomes - does RH want to lock completion of class quests behind an item which it is possible to go an entire game (L1-L200+) without finding? I would think not. If I've read patch notes correctly it used to be craftable, and so obtainable at least with some effort involved. I'd recommend (based on my experience and hearing that of others in the topic) that it either be returned to craftable status, or have it's drop rate significantly altered.
As further information about my lack of a cleaver - I never miss an opportunity to loot a sink, an oven, a refrigerator, etc. Anything related to food and/or cooking is top priority for at least the first ~50 levels. It helps significantly with eating/drinking, acid for tires, etc. I also never turn down looting a trash can or trash bag, due to the possibility of finding treasure maps in them. The fact I find far more acid, cooking implements, treasure maps, etc than I do cleavers, supports the fact people think they are too rare.