First two United goals were totally against the run of play; apart from patches of the first half, City pretty much bossed the game and were denied by dogged defending and bad luck (post rebound being one example).
Yes, the offside goal should have been given but there were decisions that could have gone either way for both sides (Smalling handball was rather blatant) - the 'free kick' that resulted in the winner was dubious to say the least - going down easily is the only way to describe it from minimal (if any) contact.
Overall, possession and shots on goal tell a different story but the only thing that'll go down in the history books is the result.