Have to say I wasn't sure what to expect from this, I have a friend who absolutely adores it on PS4 and a friend who absolutely hated it on PS4 but I went into it with an open mind. I have to say this is very likely going to be my GOTY or very likely close it (top 5 anyway). I fucking LOVE that they made a postman game basically with a AAA budget and a wanky Kojima story to justify it. Delivering packages around the game world is so incredibly satisfying to me, I genuinely can't enough of it, be it on foot or going along the highways. That along with the whole theme of connecting and with the connection to other players it's so satisfying to help folks, or go on a long out of the way route to then throw down a bridge/ladder/rope and then get a real satisfaction of it being liked/used by other players who decided to go the same route you did.
Can't remember the chapter I'm on right now but I'm basically ignoring the story at the minute doing as many auto pavers as I can and standard orders to get the materials needed. Think I've done around 1/3 to a 1/2 of the game world so far.
The handy thing with the MULE camps is that they tend to have a pile of certain materials and if you need them they can be quite handy. Whilst you can't predict what the camp will have (well I think you can't, it seems to be random but maybe I'm wrong) it's especially handy if you need say ceramics which you need a lot of for the auto pavers, and a camp is full of them etc.
Thinking about it though and I'm not sure if this is the case, but if you say kill a MULE and bring them to the incinerator does it generate a load of Chiral Crystals each time ? I've not actually killed anyone yet to try it so not sure.