You'll probably want to go tank - there are some tank classes, like Warden/Warrior and Champion/Rogue, that do almost equal or better DPS then casters, and can still tank very well.
LOL you DO NOT want to be a tank for your first character
to be a tank you need super OD OD gear and of course skills to be able to play a tank... tanks are one of the worst class to play in this game LOL
if you have average gear with average stats.... cant do much with a tank ... sure the stats for tanks are alot easier to get, getting OD GEAR is a bit problematic cause u dont want to spend golden repairs zzzz
besides there is no such thing as being end game, in another few months new content have to regear restat its a waste of money LOL and time..
and yar not much to do once u reach level cap have semi decent gear... you usually just go afk in a guild joke around, troll around, log in log out, do dailies mini games, back at afk again... and and if youre lucky enough to have active guild where alot of people actually play in your timezone then yay u get to go on runs... but only if and only you are gear enough...
then you realize oh well. lets go afk again LOL
siege is about the only fun thing left in the game, 1 hour of pwn others or getting your buttocks kick clean
then u go afk again LOL