Theres a patch that i dont think has been pushed out yet but it supposedly fixes dual GPU issues. I am running it on 1080p/Ultra high/2x MSAA on my 970 and its handling pretty good, 45-50fps normally.. I know that isn't helpful (I went through this with Watch Dogs after all) I am genuinely curious to see what exactly is causing these issues for everyone else however.. Because at the moment it seems like its only working on a handful of rigs, which tells me maybe they only tested it on a handful of rigs..
Agree on the other bugs.. Definitely a buggy release, and the movement and such.. ugh... And the lockpicking minigame.. As for the huge crowds I feel its a immersion factor, its supposed to make the city feel more populated and less like an empty void with little pockets of people and such.
Oh and the microtransactions and the chests and everything.. Oh my god that is ticking me off to no end