He basically saw the tutorial battle and just called it a night. Can't blame him by the way the reps treated him but trust me the game isn't as bad as he says it is. The game is no where near perfect but I've had a blast. The cities and areas are populated, the combat is slightly slow at the start but as you get more abilities it becomes faster and more engaging. Mobs don't just stand there being stupid. Only reason that video showed that Jellyfish stand down like that was because it's the tutorial battle that's suppose to be easy so you can figure out the controls and how to engage and kill enemies. Now about it looking generic, well that's matter of opinion. I don't think it does personally. And yea SE should have made the demo on the show floor part of the open beta so it would look more populated. It was a weak show but I think he's being a bit unfair. Also he stopped the trailer before it got to the more actiony parts of it at the beginning.
The beta is filled with lag in menus, areas and other places, there's still some crashing problems but it has stabilized a bit since it started. Also there's a few design issues SE has done that we'll see if they make it to the final release. There's not a whole lot of content in but that's expected since it's a beta. I will admit though Guild Wars looks very cool and I can see why he was wowed.