i think you mistake him reviewing the DVD for a movie review.
His main problem with the movie is the roof of the space station, which he doesn't give a score on in any case.
but when he compares the content you get on the blu-ray to DVD version, you get nothing on the DVD. nothing at all except a bunch of trailers of movies you probably wont even watch. i think this is why he knocked off a whole lot of points.

"If all you care about is the movie, then the DVD edition is just fine. But if you want more, you’re kind of screwed. And in annoying way.

That’s because while the Blu-ray has an extended scene, an interactive look at the movie’s art and design, a multi-part making-of documentary, a look at the effects, and a featurette on the technology, none of this is included on the DVD."

i think this paragraph alone is why he gave the DVD review a 4/10. basically if you like the movie and aren't interested in bonus content, you wont mind the DVD, but if you want some extra content, you basically forced to get the Blu-ray disc.

Well now i just feel bad!! Seriously dude, its great that you are even getting out there and doing something, anything! For all my criticisms i have never blogged, reviewed or had anything in print, so i admire anyone that does. Let me please retract my "$hit review" comment... It was unnecessary, not to mention wrong, as you were just reviewing the dvd extras like you said.

One thing worthy of note though is that in a huge rotating, or spinning ring shaped space station such as the one featured in 2001 and this film, it is possible with enough spin that you will force any object towards the hull of the craft, thus creating an artificial gravity... As for the atmosphere and dealing with the vacuum of space... if you pumped enough oxygen and nitrogen onto the surface of the space station it would push up against the vacuum of space and create an atmosphere possibly? oh i dunno...