I got onto Act 5 the other day with my Fire Sorceress. Then the fire immunes struck. Fire Immune Quill Rats, Fire Immune Slayers, heavily Fire Resistant Burning Dead Archers... I finally snapped and... Teleported ahead without completing quests and without even a full clear! *gasps*
I have a whole map unexplored! So many treasures could be there but I can't get at them! I did this for 2 maps and its killing me - thinking how many goodies I missed. I am now on Crystiline Passage. Cold Immunes! BWHAHAHAHA! *strikes them down with a Meteor*
I did it with gloams in act 4 once. It really made me feel awful. I am not a full clear kinda guy, but I must kill every monster I happen to find - exception made to teleporting imps. Well, matter of fact, after saving the barbs, I am used to run accross every open area right to the caves in A5. I find them boring to death.