If you give it a try though, just keep in mind there's 3 types of gameplay, you can tank, you can heal, or you can just beat up stuff.
All three roles are pretty easy these days. If you tank just make sure you hit the button to turn on your tanking mode where you aggro all the enemies so they aren't murdering your healer and damage dealers. If you heal, just heal the tank and hit the enemies when the tank doesn't need to be healed, when you're a damage dealer just hit stuff.
In terms of fun... they all have their pros/corns. Tank is kinda ez mode because you have way more HP/Def, but you do less damage so fights take longer. Healer is the most chaotic because you never know what your teammates are gonna do and when they will need heals/rez, DPS kills things pretty quick but dies fast if a tank isn't covering for you.