I am not 100% sure if things are just hidden from me on the client. But...
1. I've noticed using the perk activate whirlwind thing, it sometimes just misses with no text (could be that it just doesn't show the attack roll?)
2. I've noticed when it hits, it shows no attack rolls for hitting (could be it's hidden too? Not sure. But if it is guaranteed hit within a certain radius, it could be a bit OP?)
3. I've noticed it does not gain extra dmg, this spin attack, from anything but the physical regular stuff. Had Divine Favor up and Flame weapon, it only did physical.