If I was forming a turn 4 pug I would not let you in unless I knew you had cleared it or were a good healer. Often a higher iLevel gives a higher chance the pugs have cleared it and have more coil experience. I don't mind teaching the fight but it's time consuming and an experienced pug group shouldn't have to wipe over and over because the healer pulled aggro at spawn, got cleaved by the Dreadnaught's frontal attack, or went oom early because they spam cure 2. Just keep asking around though.