Regarding the discussion of attacking creatures (silver on werewolves, maces on skeletons, fire on trolls), I don't really get into the entire "make-belief trial and error" on common D&D monsters (UNLESS it might be interesting for the players to do so as a way to grow their characters personalities etc.!). My problem is when a player knows the entire monster book by heart, and verbally declares everything in the stat block whenever something new is encountered, thus spoiling the "oh crud!" or "oh yay!" reactions that learning about /interacting with the monster would provide. It robs the rest of the group's players of interesting experiences, imo. Try as they might to simply play their characters with whatever knowledge the player has chosen the character to have, they
will be subconsciously influenced by the spoilers (for lack of a better word) they just got.
Same thing when going to a movie. If I sit down and someone tells me the ending just as the movie starts, I will have it in the back of my mind. Try as I might I to enjoy the movie, the surprise and wonder of the ending is pretty much taken from me. This won't matter to some people, but at least at my table, it matters to 5 out of 6 players, so after a chat, the player who kept deliberately revealing statblocks/spoilers stopped doing it, and now the rest of the group get to discover things slightly more organically. The player who enjoys knowing everything still influences the others somewhat, because he/she will still deal with the monster according to its weaknesses and strengths, but at least it is much more veiled now, and easier for the rest of the group to ignore.
A) "Oh, Padikaa just shouted watch out for the tornado-spell that this ridiculously uncommon creature conjures when it raises its left eyebrow. I better run too!"
B) "Oh, Padikaa is running away all of a sudden just because that ridiculously uncommon creature raised its eyebrow? Oh well. I attack with my sword!"
Some people prefer A, others B. I don't think there is anything wrong with that, but it's easier for people who prefer B to play it like they enjoy when people enjoying A hold a little bit back on what they share with them. Player A types can still know everything if that is what they enjoy, they just don't have to spoil it for the rest.
Interesting stuff though. I am still enjoying reading this thread, which is rare for such a long one!