I was expected more Harbinger and indoctrination and less Cerberus, defeating TIM around the 1/3 to 1/2 mark rather than dragging it out to the bitter end. I guess that was a legacy of ME2 which hyped Cerberus and TIM up to be almost as big an impact as the Reapers.
I don't know why TIM was that hard to find. He's always hanging around that window with that very distinctive star; it's a pretty big clue as to where to look.