It's not really that expensive, and it's something I think is fair. I've played F2P games before, and the majority are crap. For $60 to buy the game and $15 a month, I seriously hope that the game is worth it, and if they update as much as they say they are planing to, then yes, it will be worth it. I can see the point behind people not wanting to pay for ESO on top of XBL or PSN. It does seem slightly unfair.
But what will pis me off is if they introduce a cash shop with "pay for items" or "pay for privilige" on top of the subscription fee.
And for the record I am 1)19 and 2) I pay for my own MMO's, with my own money (that amazingly, isn't pocket money, and that I earned), on my own computer that I paid for, on an internet connection that I also pay for, and I really do find the comment about "teenagers aged 18-20" kinda not fair.