Depends on the situation. If it is a clear cut case or you're a mentor/senior to the reviewee, a more direct tone is fine. If it's a matter of opinion or it's a

Depends on the situation. If it is a clear cut case or you're a mentor/senior to the reviewee, a more direct tone is fine. If it's a matter of opinion or it's a peer review then a more considerate tone would come across better.