I share info all the time, not always, but more often than not at leaste. Such info greatly assist the player inmaking wise decisions. This is a game after all, not a tactical simulation. Most fights are by my design meant to seem a challenge but really just be a 20 minute diversion to enjoy a small fight then move on. I do try describe the damage as best I can, but since players often read attack tables, and figuring DB is a simple excercise in basic math (My total attack was 212 and I am looking up 118 result versus AT 14...).
Knowing a foe is stunned for two rounds may allow a player to ignore the stunned villian and turn against another, but ey, it happens in movies and stories all the time. We have all seen the fighter take on four foes, hit two, and they are out of the fight for a brief bit: there's stun in action...unless there is a big vat of oil to dump and roll in...hmm, I suddenly wanna see Transporter again.