How does Resident Evil 5 rank in the Resident Evil series?

I haven't played Resident Evil, probably since the original Playstation version. I downloaded the demo of Resident Evil 5 on my PS3.

Are there puzzles in the game you have to figure out like in the original Resident Evil, or is it just shoot the zombies all the time?
Update: I've never played Resident Evil 4, but heard it was great. How does RE5 compare in the series?
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