The Vergil reference for Guardian is way off, though.
Definitely give a class a try before you decide whether or not you like it. I have never enjoyed the Warrior type in most MMOs but when I played Warrior in GW2 it was really fun. Same thing with Necromancers. I wasn't fond of Warlocks in WoW or Necros in GW1 but GW2 necros are crazy fun.
The main thing to remember is most of the classes that look familiar on the surface are much different in GW2 because the nature of the gameplay is different from most other MMOs. Thieves do not play like the WoW-formula rogue. Guardians are not the same as WoW paladins.
Also remember that any class can fill any role. I have made a Necromancer who is support-focused, and a Ranger that does melee damage. GW2 roles play in a very different box from WoW, so keep that in mind when trying things out
Also, the Avatar reference and the Nightcrawler reference are spot on.