I also pre-ordered Shift 2, mostly for the additional content. If they hadn't dangled the proverbial 3-car-and-40-event carrot, I'd probably be taking the same wait and see approach as everyone else.
GT5 is easily my favorite driving game of all time. While it may not have the most polished presentation, or enough offline content to satisfy most folks, the online game and the vastly improved driving physics more than make up for those shortcomings, in my eyes at least.
I'm not really sure what to expect from Shift 2, as I only spent a couple of minutes with the first game, but I'm hoping to get something more along the lines of a racing career; versus the almost literal sandbox experience that is GT5.
Somewhere along the line, I got the impression that the Shift and GTR/Race series were related somehow, possibly even made by the same development team. Is there any truth to this?