I think the reviews are pretty fair. Of course us halo fans will appreciate the game far more then the reviews imply. But the reviews are meant to rate the game on its own rights. In which case low-mid 80s seems about right for someone who isn't a big halo fan, especially since the multiplayer wasn't legitamitely remastered.
As for other remakes Medal Gear Solid only has 6 reviews so far. The score could drop significantly as more reviews start being added so I won't comment on that but I find it ridiculous that the ico/shadow of collosus collection got just as high of a score as the two original games. These games are remakes so obviously the gameplay will show signs of aging and the quality won't feel as amazing as it did when they were first played. I also think the only reason OOT 3ds got a 94 was because it was the first decent 3ds game which got reviewers really excited.
