I was somehow quite excitet for this after finishing the first one. But after quite high expectations while starting, they felt rapidly after the first hour. I didn't like the gameplay at all. And it was only getting worse first.

It really took some time for me to get into this and actually having a good time playing it. I sure had it but there are just so many things that are annoying. Only some points:
Malaria that makes you do the same thing over and over again
Travelling from one spot to another and you actually never can go to a place without being attacked by very aggressive KI. If you die, you have to make the whole way all over again which is mostly very time shredding.
Weapons you have to unlock by doing the same all over and over again but without them you are screwed
Buddy missions that basically just let you do more work but give you nothing in return

It was a exhausting game that had its moments. After having unlocked some weapons, I was able to play it customized. It helps to do the weapon missions very soon until you have your set of weapons that fits your playstyle. After this point, I had some some kind of ambition to finish it. I did not really like it but it still made me want to play it. I guess it was just ambition