Such a nice video with perfect quality. I loved the end of the video in the arena battle. The player did pretty well and that last fight looked hard as hell. Without using ranged weapons it would be quite difficult to complete.
Actually the best part of that video was seeing how important strategic fighting can be in tough battles in GW2. The second battle in the arena, he almost died but he smartly dodged the big sword attacks, and thus beat the guy. That final battle, he was unable to dodge two rocks that the devourer threw at him, and they took about 50% of his health each time. However, if he had somehow managed to dodge as he moved up closer to attack, he might have been able to go toe to toe with the beast and take it down.
All in all, yet another example of how the combat is different from other MMOs we've seen... it's like they went and did what AoC was trying to do with the dodge mechanic, and got it right.