The links below will take you to the relevant post concerning the review of different editions of titles, and how they compare against their vanilla counterparts. Each is assessed according to the value of the bonus material in regards to the additional cost, and will consider every piece of additional content.
All reviews and thoughts are solely my own opinion, and do not contain any bias towards a particular retailer, developer or publisher.
Alone in the Dark (Limited Edition)
Assassins Creed 2 (Black Edition)
Assassins Creed 2 (Film Edition)
Assassins Creed 2 (White Edition)
Batman: Arkham Asylum (Collector's Edition)
Bioshock (Collectors Edition)
Bioshock 2 (Special Edition)
Dantes Inferno (Death Edition)
Dead Rising 2 (High Stakes Edition)
Dead Rising 2 (Outbreak Edition)
Dead Rising 2 (Zombrex Edition)
Dead Space (Collectors Edition)
Dragon Age: Origins (Collectors Edition)
Fable II (Collector's Edition)
Fable III (Collectors Edition)
Fallout 3 (Survival Edition)
Fallout: New Vegas (Collectors Edition)
Ghostbusters: The Videogame (Slimer Edition)
Mass Effect (Limited Edition)
Mass Effect 2 (Collectors Edition)
Medal of Honor: Tier 1 (Limited Edition)
Prince of Persia: The Forgotten Sands
Red Dead Redemption (Collectors Edition)
Resident Evil 5 (Collectors Edition)
Smackdown Vs. Raw 2011 (The Hit Man Special Edition)
Smackdown Vs. Raw 2011 (The Lord of Darkness Special Edition)
Smackdown Vs. Raw 2011 (The Viper Special Edition)
Splinter Cell: Conviction (Collectors Edition)
Splinter Cell: Conviction (Limited Edition)
Star Wars: The Force Unleashed 2 (Collectors Edition)