The Illusive Man runs a super-powerful organization that opposed you in the first game, because they are inept pro-Human terrorist mooks. Then he brings you back from the dead, because he opposes the Reapers. But then he’s attacking the Citadel, because he’s… pro-Human again? But then he’s husking Humans because he wants the Reaper power for himself. Later on he tell the Reapers what the Prothean AI revealed about the catalyst, either because he’s indoctrinated or because he knew how the Reapers would respond. And then at the end he’s just a stupid crazy idiot who got indoctrinated ages ago.
You can’t say any particular thing is a plot hole, because he has character elements to justify almost any sort of behavior. His only real motivation is identical to the motivation of the writers: Oppose Shepard no matter what she’s trying to do, and oppose her in a way that leads to squad-based shooty combat. TIM is the avatar of the writers, and he doesn’t step out of the way until we meet the Star Child. Who is arguably the same thing. This is true of a lot of videogame antagonists. The problem is, it’s not supposed to be this obvious. Usually the writers hide that sort of thing behind a curtain of of characterization.
This could have been done much better, is what I’m saying.
Sorry for the rough start to this week. It really did take us a long time to get it all working, and by the time it happened some of us were tired and irritated. Maybe that was just me. At any rate, we’re near the end. Looks like we’ll finish this game right around the end of the month. We’ve picked out our next game. I won’t reveal what it is, but I will say the next season is likely to be a lot more positive.