I'd run Castrum Meridianum and The Praetorium with new players with or without tomes. I would even wait for them to watch every cut scene. Why because these two dungeons or not hard but glorified fates with a linear set paths. Want your myth? Want your weekly cap? Than go do the hard mode or something. We all pay this game and we all want to have fun. Just don't get mad when you go into a dungeon that is a part of the main story.