I've noticed this, though I have seen similar problems with 3DS reviews. Killzone Mercenary, however, was an especially glaring example.
I've read several reviews which continuously referenced other FPS titles, which would be fine, except those other FPS titles were often home console exclusives. That makes no sense.
You would think that these reviewers, people who get paid for this, could look at a handheld and a home console and determine that they are not the same thing. If someone is doing a motorcycle review, do they constantly compare it to a car? Not if they have any credibility.
If they're going to penalize the handhelds for their inherent weaknesses then they should do the same for home consoles. Why not deduct points from home console versions because you can't take them on the bus or the train with you? That seems fair.
The big problem I noticed was that a lot of the reviewers didn't seem to want to be playing a handheld in the first place. This is why handheld reviews in the west will always be problematic. Personally, I assume that a handheld game won't get a fair shake, so I look at review scores as being extremely flawed. A 77 on a Vita or 3DS release pretty darn good.
