Voted.
Just taking away the old system is a bad move, especially for those who don't play large multiplayer servers and thus don't benefit from better performance. I had no problems with lag on the private server I was playing on, nor did I have any in single player.
Furthermore, I don't think I need a big "reason" to want the old order-system back aside from my own preference. I simply liked it how it was, I don't like the current mission system at all and would prefer not to use that.
Please give us the old system back as an option.