Had a game last week which was my first time taking Euryale. I tried playing the gorgon trio against a team of Ludus Magnus with Nero.
I got wiped out, as I always do because my friends are much better at games than me, but there were some interesting moments.
Basically, I moved Euryale up first, and she ended up getting charged by Nero, Septimus and Viatrix. I thought it would be cool to use her constriction to inflict damage on all three of them (I assume that it would inflict damage on both of the mounted pair), but she got her first form taken out and got exhausted, so I never had a chance to activate her before she was defeated (we weren't using ludus benefits in the game).
Medusa was supporting her in this fight, and she used her Ichor to take out Nero's first form with the two damage, which was kinda fun.
Stheno was fighting Tribune and Otho on the other flank, and she used her Dance of Death to good effect to continually fling them into hazards to exhaust them, and she ended up taking out Tribune without him having made a single attack all game. He was also very sad that her Inevitable ability completely cancelled out his Sanction ability (he gains a Favor whenever an attack against him is unsuccesful - but her ability means that she always gains one success and cannot make an unsuccesful attack).
My thought on the gorgons so far is that they seem to suffer from the fact that their second forms are much more powerful than their first, and that makes it hard to be aggressive with them I think, since there are so few of them and they need to take a lot of damage before they can shine.
Also, Stheno is really hit or miss. She has armour zero and really low damage - her second form only has 8 damage in her damage tree in total. Yikes. So she really needs to throw people into hazards with her Dance of Death ability in order to do work. But her Violent ability on her second form giving her an extra attack obviously helps with that.