Yeahh. It was a rather piece of crap. But I thought they had a tutorial level at the start? It was...vague, to be honest, but it taught me what I needed to know. The control scheme is rather awkward for the PC, but once you get around it it should be fine.
I frankly only found the repetitive missions boring, but the free-running made up for it. I loved climbing around the buildings and killing guards for no reason at all.
The white flashes are just to fit in with the futuristic concept of 2012, so I have no complains about that.
All in all though, just stick through with it. It's not that bad a game and it's a perfect setup to AC2 and AC:B.
Also: GOD DAMN UNSKIPPABLE CUTSCENES.