Cleric melee nerf on last patch.

[The Great Misanthropist]

"Cleric's Blunt Weapon Mastery physical attack bonus has been changed from 15% → 10%."

I have no idea why this was necessary, I have never seen any complaints about Cleric's melee abilities.

[Aldain]

It's more that Maces are already pretty strong in terms of base stats and they have native armor penetration.

Consider that Most other weapon specific mastery skills like Sword and Rapier give significantly smaller flat numbers to weapons that don't penetrate armor, the only exception is Dagger Mastery which gives +15% as well but to weapons that have a significantly lower baseline of damage to work with.

A basic Flanged Mace has a base damage of 33 and 15% Armor Penetration, that's only 6 less base damage than a Longsword of the same quality and the Longsword lacks any kind of pen or the ability to use an offhand tool (though it can block/counter it also requires a bit more finesse than a shield does).

[Boutus]

It was needed badly, as cleric with mace almost always gets a headshot hit due to the angle of attack, and what is more, he can slow you down and buff himself. In short, it doesn't leave anything to act as a foil or counter.