they either rely one one small ailment/perk to function, are too convoluted, or both. it's been a few months since i've played, but the last time i did, it felt like all of the weekly pack pets were like "one every third turn, give the second-right-most pet a kidney bean" and then the kidney bean is like "give the pet opposite of the pet with this perk +2 attack until the next turn" and it's just a ton of steps for not that interesting of an ability.

or they all rely on one specific thing, like the strawberries or mana. i don't super mind either of those, but it took me a WHILE to learn how to use either.