Of course. Those Heroic PuGs are not meant to carry casuals, they are meant to gear up Alts from people that actually raid. There are some raiding guilds that haven't killed Heroic Imperator yet, it's not as easy as it seems. Why should an unorganized PuG carry you when they have the option to have a smooth run by requiring AotC achievement? You should stick with Normal Raids if you won't bother yourself to join a raiding guild...