Preview Bias in Portable War Coverage?

KaiEl writes "Is Nintendo being penalized in the press for releasing their Nintendo DS before Sony's PSP? That's the quesiton I ask in a recent post on The Video Game Ombudsman. While DS games are being held up to the harsh standard of hands-on reviews, PSP coverage is mostly rosy glow previews and lofty PR promises. Readers comparing the two very different types of writing might notice a "preview bias" that seems endemic to video game writing. Is this a serious problem, or am I just expecting too much from what is simply a preliminary review?"