Sounds to me like it might be the video card or the drivers. If it freezes at the exact same place - then it might be trying to render or DO something that your setup doesn't like. If it freezes at random - then it could be heat or power related.

Unfortunately, it can be so many things - and I'm usually very hands-on when I diagnose issues.

As for GW2 - you're not really missing much. Well, I guess if you enjoy super casual gameplay that takes almost no effort or investment - it might be good