Ermm... a discussion in a forum?
I understand where you are coming from, but since a review is a subjective opinion of an individual that has played the game, I can perfectly understand someone saying, "I would enjoy this game more if it was portable".
It can perfectly earn a worse score because of the platform it exists on, for many reasons, because a platform can make the game feel limited or different, and even play different.
Going back to my Monster Hunter comparison. You immediately miss a second stick, and even if you have the new 3ds, you miss a propper second stick. That didn't stop me from pouring over 300 hours on MH4U on the 3ds.
The platform CAN influence how a person enjoys the game and influence this or hers opinion on it.
Obviously you don't have to agree. I don't, I enjoy playing on my TV way more than portable, but I can totally understand that someone would enjoy the same game more on another platform because of personal preference.