I interrupted my most recent playthrough after getting hooked on Old World but eventually I’ll get back to it. Despite having logged over 300 hours, I’ve only actually completed exactly one (1) game to victory conditions.
However, I’ve only ever played on the default (veteran?) difficulty level and I’ve never had a problem placating all of the factions. I’ve generally done the faction specific missions, but I generally don’t do any raiding, for RP reasons.
I find the strategic and tactical layer very satisfying. I’ve never played with festering skies turned on (that doesn’t look fun!) and the one game I did complete had the early dlc and the corruption dlc but none of the others.
I’ve never discovered a broken build, but maybe I’m not that good at the game, and I have trouble with builds anyway. For that matter, I’ve rarely used mutations or cybernetic. For that matter, I’ve rarely used ground vehicles (in fact I usually sell them off) because I enjoy the squad based tactics so much. But I can see how they would be useful in scavenger missions.
It sounds like I’ve barely scratched the surface. I guess I’m going to have to start another playthrough. After this game of Old World.