Can't really say that Yahtzee claimed anything that's not right. Some elaboration however could be useful here.
The standard-fantasy:
Pretty much yes. You have the typical bow-wielding elves from the woods, the bearded dwarves from deep below the earth who are always the first to be horribly raped when something evil comes and the humans who are practically incredibly average but pretty much awesome because of that.
Bioware tried to mix the clichees up however...even if only a little bit. The elves are parted into our well-known forest-elves, although they're rather upset at the humans than arrogant, and the city-elves who live at slaves to the humans (at best). The dwarves are almost extinct, but so far I didn't see them humping everyone's legs for beer so far. Yes, they're still stereotypes to no end, but then again, I remember the last game who tried to f*** with the Tolkien-stereotypes a (tiny) bit and remember the beatdown WoW got for actually turning the bloodelves into power-hungry mage-addicts and turning them to the Horde.
The other thing about this point is something related to storytelling as general. I think it's pretty hard to come up with something that hasn't been done in the last thausands of years and still makes sense. I mean, yeah, we could turn the elves into bloodthirsty, meatbags with the manners and ethics of Orwell's dictator-pigs, but thinking about it all we would've done then was renaming and reskinning the stereotypical orc, wouldn't we? And if we don't go for extremes and make them rather...mediocre...then we would have the stereotypical fantasy-humans.....with pointy ears.
Dark Fantasy: Erm, yeah.....no, not really. Like Yahtzee and at least 5 more people here said it's just fantasy. What I CAN sign would be the term Dark Bioware-RPG, since this is the first of their games where I, as a player, can actually understand the permanently proclaimed horror and threat of the Darkspawn in contrast to other Bioware-games where even death isn't really that scary. So yeah, it is much more brutal and, for once I want to use that term, "adult" than previous Bioware-titles, although admittedly the thing with the blood was a bit off to me. Yeah, I know, if you fight in close range against enemies with sharp weapons, you probably will get messed up with blood and gore, but for heaven's sake, why do my characters look like they just jumped into a blood-sprinkler when they only lashed out at a friggin' wolf for two times?
The dialouge: Well, as stated, if you complain about muuuuch dialouge in a Bioware game, you might as well be complaining about an orange being...orange. As for me, I acutally enjoy the conversations in this game a lot more than in the previous. Bioware finally, finally realized that they suck in making a credible moral choice-system, so they replaced it with an "approval"-meter that only applies to your companions and make them agre with and help you or disagree and eventually leave you. It's rather refreshing for Bioware that the spoken word has a credible consequence. If for instance you start to insult Morrigan you will loose a good portion of her approval guaranteed and if you tell her to leave because you can't stand her, she actually leaves. Yeah, it sounds stupid to be giddy about something that is plain logical, but hey, we're talking about a Bioware-game here, where you usually could violate every single part of your companions' ethics and they would still follow you, saying that they don't like what you do.
So, as far as my unsignificant self can say, I like (yes, present, not past form) Dragon Age so far, although I do hope that there are not only six different beginnings but also at least several possible endings and hopefully even som unique references to the specific starting-scenarios.
Last but not least I want to mention the combat, which I like very, very much, since it does actually needs tactical effort. Yes, you indeed have to think about things like positioning, using weakening spells and strenghtening spells and efficiently decide which ability to use in which situation which is a refreshing contrast to the typical "You are the heroes of the game, here are 5 billions healthpotions, click your enemies dead"-scenario.