I think that's a great idea!
As well, it can help people realize that if someone is new they may not have a full understanding of the mechanics and there is a reason the Tank is moving slowly ahead looking around every corner

Last night was my first group, first dungeon. I mentioned right away that this is my first time and I was the tank, wanted to be honest. No one replied (PS3 players?)

We got through the dungeon just fine everyone doing there thing properly and I said "great job everyone". Still no reply lol .. it was weird