I think 30 is 30. If you got there, good for you! If you're 30 you HAD to do the raid guaranteed to get at least 1 piece of raid gear, so we all know you're at least experienced with normal. I think this really comes down to more raid etiquette. If you haven't done Hard before and you join a random team, tell them! If you have a team that is experienced and you're picking up one more random, ask if they've done Hard before or not, and if they haven't and you don't have the patience and time (lol) to teach them then let them know that.