It is supposed to be a "neutral" page for comparison, e.g.

http://www.google.com/phone/detail/sony-ericsson-xperia-x10

If it is a marketing page, it is marketing for Android as a whole, not specifically for Google branded Android phones.

The marketing page for this particular phone is here:

http://www.google.com/nexus/

The tech spec there doesn't list missing features

http://www.google.com/nexus/#!/tech-specs