Oh yeah due to the stamina system they are manageable. But they changed it with the latest patch for the better imo.I actually killed that guy at the very start of the game, it took some patience but 1:1 fights against humans are not hard in this game. Which is why every faction has at least 1 duel possibility in their recruiting questlines.
I fear that i will not complete the game for quite some time. Sooooo much to find. But i want to know how it ends so i may end up rushing it a bit.
The chaos you can create and then get out of with your jetpack is awesome. I had a bunch of skex on my ass in the forbidden valley, then encountered some more creatures and they all ended up fighting each other. I quietly sailed away with my jetpack to a high rock in the middle of nowhere, while all sorts of enemies duked it out below me. Great moment. I did not dare to touch the ground again until i was a good distance away, flying from one high spot to the other.