I dont think the plot was confusing but a lot of Bond's actions were. He did things that were border line retarded. Even his motives were confusing. He felt betrayed by Vesper yet her memory is enough to make him go into some unstoppable rage across the globe. he couldn't avoid getting people killed, people that were integral to his investigation, fellow spies on his side, friends.. but he was really good at saving that one hot piece of ass and even got her revenge fulfilled for her. I suspect that he had more invested in Olga than he ever did in Vesper and for no reason whatsoever...
And HOW did those clumsy mofos from Quantum keep themsleves a secret all that time? I'll tell you how... no one cared. They could have used Get Smart's Cone of Silence and hid their agenda better than that retarded conference over bluetooth. I really like Craig as Bond but these plot lines are kinda inane.