I've played the game, and while I agree with Yahtzee... it only holds true for literally like an hour of the game. That's more time than he agreed to play FFXIII, for god's sake, so you'd think he would have gotten around to killing something, but he never brings up the actual meat of the game.
Yes, there are annoying fetch quests. Besides the first rank of missions, none of them are *ever* required. You can just kill crap. At the end, they stop trying and just give you missions that are literally "Get no reward, go out and collect stuff." You get one of those missions for each area, so if you really do need resources, you can go get them, but I hardly ever needed to.
Yes, you might have to worry about selling stuff that could be used for upgrades... if there weren't goods that flat out said they were only there to be sold, and if the fishing boat (which you unlock a bit after 1 star quests) didn't give you free money, and yes, you have to grind for ingredients... if you don't have the farm, which lets you get infinite of basically everything but monster parts and ores (which you can get from the fishing boat).
So basically, all of the grindey fetch quest stuff is gone after the first hour, which is basically a glorified tutorial; you have a mission to gather a few different things so it teaches you the carve system, the torch system for caves (not hard to teach, but still), and then the mission where you get attacked by a giant monster teaches you about unstable missions, and how you can be interrupted by other boss monsters, which exist throughout the game. If Yahtzee was really at that beach waiting around for the monster, he never learned the games system for missions, which would require either ignoring the games advice or not getting far enough for the game to have told him that (or not reading the manual, but who does that?)
After that, the only complaint that really exists is the lack of processing power, which I can agree on, even if the loading screens are about a second long, and the monsters not attacking each other, which isn't quite true; basically any big monster will murder the qurupecco (bird monster that imitates others calls) half the time, and try to murder you half the time.
There are tons of valid complaints he could have made (even though I still find the game fun, it's not faultless), but he never got far enough to mention it. Some bosses, when they enter rage mode, are nearly completely unhittable, a lot of items require grinding monsters (significantly more fun than grinding plants) to upgrade, the drop system is annoying, and the "carry eggs" missions are incredibly boring and frustrating. The game's still fun, it's just that you have to get there, which, while Yahtzee says isn't a valid complaint, when you "get there" in maybe twice the time it takes for you to actually get the portal gun in Portal or the time it takes to get to do something on your own in Just Cause, it seems a lot like he just wrote off the review from the start, played the first three missions, and left.
EDIT: As for the people who are saying they agree so much, it looks like crap, etc... did you ever notice him mentioning the actual monster hunting in the review? I'm probably biased, and I know how the game works, but you'd think that in a review of a game primarily about killing giant monsters, the fact he only talks about running from one and killing near-defenseless minion monsters would be a tip off.