I loved Trevelyn, because, first, super man-crush on Sean Bean, and second, I loved the idea of him trying to get retribution for a perceived(?) wrong done to him and his family by England. When it comes to villains, I am all about their motivation. I am oversimplifying, but I like there to be something more to them than TAKE OVER THE WORLD. Of course even the simplest Bond villains aren't that simple, but you get the point.