the gw2 engine is amazing compared to swtor. very well optimized and i believe will be able to host the vast majority of pcs. More games are like that as i can point to tera being playable on a low mid computer on high graphics easily.
of course no new game will ever beat out wow but guild wars is doing a very good job on it
Edit: i would say worse come to worse you can always just downgrade graphics for like WvWvW pvp or the big dynamic events if you're on the lower end of running on medium/high