Lol at people that blames lag for getting hit by eruption/dash, that is what the baddies usually does, blames it all on the lag!

The issue isn't with PUG class, the issue is with you playing horribly and another issue is playerbase mentality, when it comes to old content like Ifrit, nobody really wants to wipe anymore, so anybody that might cause a wipe is a liability even if you are new to the fight.