If a player says its their first time doing something on a certain job, I will give them the benefit of doubt, I main SCH but my very first clear of A1S was as a PLD, the WAR was my friend who guided me on voip on when to use CD's and it went very well, though my damage was a bit on the low side (getting better now that I am getting the hang of the fight) Hell my first clear of T9 was as a MNK, I am not a very good MNK, for the entire run, I was pretty much panic slamming the keys and we actually beat it, I was just as surprised as everyone else (at least I wasn't lowest DPS)

As long as you know what your role is and can execute it properly, you won't hear any objections from me, I won't tolerate people looking for a cheap carry though.