Having recently been burned by Dungeonaday (I resubscribed for a year just before they announced their plans to shut down), I have serious reservations about this site.
Also, the sample adventure has some issues that concern me:
1) The map has no scale.
Actually, if you look to the right of the dungeon, about midpage, the map does in fact have a scale.
2) The Blade of the Sun Lord is described as an artifact, and we're told that the runes on it radiate magic, but we're not told what kind of magic the runes radiate, the strength of the aura, or anything at all about what powers the Blade has. Did I miss something? This seems like a major omission.
You are correct that the type of magic and strength of aura were omitted, I have brought this to Jonathan's attention, Thank You. Regarding the question of what can the sword do however, there is an entire detailed write up clarifying exactly what powers the sword has.
3) There doesn't seem to be any way to run the adventure without having a laptop or tablet in front of you. That alone is a deal-breaker for me. The FAQ says, "As a member you gain access to the adventures and may run them straight off the website." I don't want to run them right off the website.
So, based on the sample adventure, I would not subscribe to this website.
In regards to your third point in this post, the target audience of this site is obviously comprised of those who have brought their laptops and tablets onto their gaming tables. There are ways around that obviously, but that is the target model in this instance.
In the end, this is more along the lines of what this site is, a collection of adventures with support material made available at the rate of a new adventure a week. If the model doesn't work for some folks, that is to be understood, not everything will work for everyone. but the guys founding AdventureaWeek.com are looking at where gaming is going, and we're seeing more and more publishers and companies aiming RPG product towards the virtual as playgroups go online, and GM's taking advantage of more and more PDF's to build vast libraries that require no room, at a fraction of the cost of dead trees.
Again, I understand this model doesn't work for everyone, so do they, which is why PDF's and POD have been discussed, but the site isn't even open yet folks, let them walk before you tear them down. They just might surprise you.
EDIT- As Jonathan has reminded me PDF downloads are free to Annual Members and $7 each for everyone else... Member or not. So the site is actually very usable for offsite preference.