I didnt watch this game, but watched England vs Brazil with my kids. Everything from entry to exit was smooth, we did not have any problems whatsoever. The only thing which could have been done better was drink and snacks, there were few outlets with lot of rush. We were back home in 15-20 minutes after the match ended (okay i live at a walking distance from Khalifa stadium).

Traffic probably is going to be a prblme, since no one uses public transport in Qatar.