the main campaign has always been devoid of challenge (at least compared to the side missions). But the gameplay didn't grip me at all. The gunplay was not to my taste (still better than control, worse than destiny and titanfall), the melee was boring as heck (felt like skyrim), and the hacking was pretty boring (but with unlocked skills/upgrades/perks, its fun like watchdogs).
I don't mind challenging encounters. Heck, i even okay with stupid boring challenging encounters like in Destiny 1 with bullet sponge boss and almost 1 hit-kill rockets (hello valus t'aurc!). But i really can't stand gameplay feel that doesn't fit my taste. Like destiny 2 and its stupid amounts of busywork. Its simply more fun to play when i skipped them (ignored all bounties, ignored seasonal objectives, etc).
The main problem is the AI. is lacking, stupid, buggy. I found the final boss boring. I die a couple of time for not taking him very serious but it was so easy to kill...And I play in Very Hard. I was only lvl 27 with minor crafting/upgrades.
A friend of mine who play RPGs played this game like he normally world, lvling, investing in crafting, etc. He got to the final battle at lvl 38 and it was extremely boring to him, the enemies literally couldn't deal dmg to his character....
I hope they fix this for the DLC and also get a fking better ending.