Having done most of the missions I would say this. There is no endgame. After 50-60 hours of doing most of the main missions, and etc. you get bored quickly. Also, there are lots of things the games do tell you, you can't scrap ANY unique weapons or they would be posted forever, however only some weapons are cool enough to keep some the pistols, swords are.
You also can't replay any missions.
I mean I got my money's worth out of it, but the side missions need, and gigs need to be better made and have better rewards. The gigs are just grinding money-making bull.
This game needs mods bad. It's like a better version of Skyrim, but needs more areas, unique quests, replaying missions, more weapon animation diversity, and so much more.