Hey,
I can understand that you may be a bit of a “shock” :)
Goblin Wolfriders are very dangerous against low level troops, but can be handled pretty well by higher tier mercs. It’s best to avoid them for the first few levels.
I suggest reloading and playing the engagement several times to learn how the wolfriders work. Same thing happened to me. On the first try I got obliterated, later i managed to survive pretty well.
That doesnt mean the balancing is final and we know the riders can be very challenging to play against, but please play some more and dont judge after the first fight.
Cheers!