In all seriousness, though, I actually do think that Anders is a fascinating character. Calling him a terrorist is, I feel, a bit too simplistic. He simply understands the inevitability of full-out bloodshed and he doesn't do what he does out of hatred or naivete. It's a highly rational action for which he assumes he's going to pay the price.
I feel like you can find an historical counterpart for Anders in John Brown (extremely staunch abolitionist who basically started fighting the American Civil War a few years too early). Even to this day, Browne is a pretty controversial figure, but incontrovertibly, his ire toward the practice of denying all freedoms to a group of people based upon nothing more than a fact of their birth was well-placed.
I think Anders understood that weak leadership was in a very real sense dooming the Kirkwall circle mages to a slow but sure eradication. Anders saw the vicious circle: that the Templars would continue pushing mages further and further into the corner, and that increasingly desperate mages, fighting for their lives, would turn to blood magic. And everytime they did, it would just fuel the hatred against them, and further justify the Templars' actions. There was only one way it could end if nobody did anything to finally force society to take sides in open conflict.
My Hawke just couldn't kill Anders. She'd been fighting for the rights of mages for the past ten years. Anders simply fired the first shot in a war that everybody saw coming. Let's not pretend either that the Chantry wasn't complicit in Meredith's utter subjugation of the Kirkwall circle.
I actually just stumbled upon a discussion page on the Dragon Age wiki where a few others draw this same analogy.
In terms of personality, however, Anders is a douche. But of course he is.