quoted for truth. Mercenary mode provides so much replay value, i can't believe its a mini-game

His time is limited. I don't think he cares much about replay value.

RE5 has a pretty terrible single player/co-op storyline.  It was as if a 14 year old was in charge of making the game. The gameplay itself is pretty fun but there is no real sense of engrossment because of many of the decisions the game developers chose in order to make the game more casual friendly. RE4 on the other hand is the epitomy of an engrossing game. 

according to metacritic RE4

RE4. RE5, while good, is highly derivative of RE4. Not only that the partner AI broken. Co-op is a nice addition but I really wish the development team would have worked on Sheva's AI for single player and frankly put together a better overall scenario. RE4's original controls were a step in the right direction but RE5 still using the same setup 5 years after the fact is borderline sad. If you throw in the Wii version it's no contest.

4 no question.