I personally (agree) with the insufferable dipstick. There are a lot of half funny, half infuriating things that new players do. Granted, I could call myself a new player to MMO's because even after years of playing them, I sill do not understand the mechanics behind them all, but there is plenty to learn from every one.
I for one have a gripe with fresh 50's that walk into a hard mode lobby with no gear, never having done the instance before, and expecting to tank. Now, I can tank most PVE instances with out a hitch, but even I know when I would not be the ideal tank, so there have been plenty of times where I queue up as a DPS with my vanguard. The funny/infuriating part is, every time I queue as a DPS for a hard mode, our tank is always a fresh 50 without gear; who has never tanked that particular instance before.
Now, I understand the desire to be a tank in the group finder, as queuing up for DPS often yields you a ridiculous wait time, but do not queue straight for hard mode on missions you have never done, when you have no gear. Constantly being the downfall of your group only gets you kicked or causes the good players in your group to conveniently "DC" in anger. You will never finish that flashpoint if every one leaves you by yourself.
If you want a shorter queue for group finder, go the old fashioned way and let people know what you are and what you are looking for in the general chat. 80% of the time, you will be plucked after only a few minutes by a group looking for that final piece. Or queue as a tank in a story mode flashpoint because the vast majority of our job is to know the engagements: when and where to pull, the baddie's attacks that you need to watch out for, and the particular environmental follies that can be used against/for your team. Tanking isn't as easy as just taunting the elite or champ, make sure you know the instance you queue for and don't queue for one that you are not prepared to do properly.
As a side note, once you hit LVL 50, you receive a free set of PVP gear at the PVP terminal on your fleet. Depending on how your character is geared at/close to endgame, this gear can blow away your current stats; all you have to do is claim it. Do us all a favor, claim it. It might be PVP, but if it is an improvement across all of your stats, it can be used for PVE until you get better gear.
08/23/2012 : Edited for grammatical and typographical errors