I don't think Vicovaro medics and Assire are OP.
Their winrates are (very) bad (<50%) and the chance you'll cross them is (very) low.
In the end every deck needs it's weakness(es), if you face them rely on strategy instead of routine.
The starting post already answers the problem: it's not the graveyard but the NG alchemy deck.
Regarding the NG alchemy deck, I tried it this afternoon to learn it's weaknesses.
What I've learned so far is that they are vulnerable to:
- Weather effects, to benefit from mahakem ale they need 3 rows
- Banished units, with mandrake and mardroeme they only can ressurect a limited number of units with ointment
- Scorch, with all the mahakam ale boosting you can deal a lot of damage
- Artefact compression, in many decks you can play this twice
- Charm, flip their lowest units to your side
- Foul ale, a guaranteed 18 damage
- Counter Foul ale, by placing all your units on one row
- Draw cards, fill their hand up with alchemy cards making vicovaro novices and vesemir less usefull
- Letho Kingslayer, deal a lot of damage to an mandraked + boosted ressurected leader
Still the viper witcher and in some decks the slave driver are too disrupting.
The only thing you can do about this is sharing suggestions on this forum and wait for a balance patch.