I recommend going solo in single player. The AI partners are only good for sacrifice spells. If you want to see how useless they are, die on purpose during a quest and asked to be sacrificed to enter ghost mode.
lol! It happened to me when I took the dark arm bots with zero affinity to a quest. Dammn things sacrificed me the first chance they got and then proceeded to be pounded by the archfiend. Shit was hilarious.
Oh top of page: Umm here is a throwback to classics. Buy Unit 13. Really fun to play co-op and in short bursts. Lots of content on 9 maps that spawn 36 missions and then we have 9 high value targets and daily challenges and ability to play those 36 missions in a dynamic way.