While its fine that you don't want to rebuy games, using the Metascore as your reason is pretty laughable. As I said in another thread, for collections, you really don't get much higher than 90...most reviewers dock a point just because its not a new game.
If you think that the improvements and the online would be worth it for you, I think you should ignore the metascore and get it anyways. If not, then why did you even preorder the game in the first place?