The lifesteal was actually the factor making the werewolf very strong as it healed based on the damage roll and not the actual damage (after armor etc), it also healed off from overkill, which made it so strong, I changed it so its based on the actual damage it deals that for the next update. But might be a bit too weak now, but ill leave it as is for now.
In regards to targeting. Its currently: pick nearest target and stick to it until dead or invalid.
But I was considering adding targeting that's weighted towards attacking the Armor type you are strongest against, but I haven't pulled the trigger on that yet.
I also had the idea of like for example making the orc rider try to kill ranged units/backline so you have to kill it fast or have taunt.