The stuff he says about the "ecosystem" is true. The world feels more organic than some other games, though there are ways this could be improved upon. The segmented map is one thing which makes it feel more fake, and smaller than it really is.
The monsters do have a lot of tells, though I think there should be a few more visible signs of weakness. There have been times where it felt like I haven't done any damage at all to it. It can also be a bit annoying to have to wait until a monster decides to leave an area for it to show that it's limping, but sometimes this just doesn't happen.
The only problem with the monsters' weak points is that there is no way to figure them out within the game. They must be looked up on the Internet.
I would have to say I've had about the opposite experience when it comes to people online. I don't think I'd say I've run into very many "jerks," but it's rare that I'll meet someone who is helpful and polite. Many people are generally silent, and will just use the shout-outs if they have something important to say. Some people want to rush rush rush, and never take time to chat, prepare, etc. I have also run into many people who are... well, I don't want to say "incompetent" because it sounds elitist, but they don't seem to know too much about what they are doing.
The stuff he says about making your own stories definitely rings true. In fact, that's the only thing which makes the game for me, as I find it to be rather mediocre based on its own merits. Were it not for this forum and the wonderful times had with its great members, I'd have never even bought this game.