User reviews are tricky for that reason. User reviews for splinter cell take a bigger hit than they probably should too because it's not what loyalists want. I understand the frustration but people take it to the extreme.
Oh, for sure. The Internet is the land of hyperbole. The problem (and this ties into my entire view on game reviews to begin with) is that these emotionally charged opinions have cold, hard numbers attached to them that unfairly drag these games down. But that's another conversation.
The console version is supposedly "definitely" getting the expansion. LINK
But there are no plans for official gamepad support or couch co-op on the PC, which is what entices me about the console versions.