Is he really that bad? He is clearly not Lady J or Lilith good, but I think you are underestimating the 0 actions, and his Wild Heart spell.
Here is how I would run a melee Marcus turn. Requires nothing but a 3 or higher of Tomes for specific cards.
0 Action Wild Heart - cheat or flip the tomes. 3 effects
Bear +2 Dmg Eagle Plus flip on attacks and Tiger/Serpent depending on if you need to charge. Alternatively, if going up against someone more dangerous that you can't kill in one turn then then Bear, Eagle, Fox and save the other 0 action for stare down.
Against the more vulnerable target you are getting 3 attacks with plus flips to hit and 3/4/6 damage which is enough to kill most targets, especially with some cheating. One will even have a + damage flip. Against tougher targets you get 2 attacks with plus flips at 3/4/6 damage or 1 charge and attack and they are going to be minus to all flips while you are Def 7.
That isn't bad, particularly for a more casting oriented model that will be healing up, dodging around, howling if Harmless/Terrify/Pandora is a problem.
I'm not saying he is all that great, though more combos are going to be great. One thing I have seen is that he only really offers Howl & Primal Flame to support his own beasts, and Defend Me for them to support him. This means he doesn't need to go beast heavy. You can just as easily have a few key beasts and something like Joss for laying down beats.
Also, he is probably the best Arcanist in the game for certain objectives. Not only can his beasts jump all over the world, but he can too with Hare.
As for OP, Zoraida feels a little lost for me, and Som'er seems to have problems with certain lists. Ramos seems like he requires a fair bit of luck, and alot depends on what cards you draw/flip. More so than other masters.