Recs.
Updated
SpecsUpdate
Pros
Pro Tons of Collectables
Tons of upgrades to find, plus concept art, story intel, character intel, and costumes. The upgrades are marked on the map, but the other stuff is not.
There are also challenges to unlock: Survival and Beacon Challenges. These are also not marked on the map. I imagine getting 100% in this game would be pretty tough.
That being said, every area has a notification of what percentage of its items you have collected that displays on the map screen.
Cons
Con No "Fast-Travel" really
It is a big game world, and most of the time you are stuck exploring it all by foot. There is something that lets you travel between areas, but they are few and far between and not really all that helpful. Plus, it is unlocked fairly late into the game. If you know there is something you need to return to on the other side of the game, you are in for a good hike.