I wondered how the rumble triggers would work, I felt like they would be too distracting, but they way you describe it for Forza 5 it makes sense and seems like it would be really useful. Did you try any other games that used the trigger vibration?
Unfortunately I didn't. MS had fewer kiosks setup for games than Sony and most of those (BF4 and Ryse) had a crazy line. The only other thing I could have gotten in to play was Killer Instinct, but I forgot to swing back by to try it.
Just in case anybody cares, there's some trading card codes floating around for Destiny that will apparently unlock something in the game or on the Bungie.net website. If you want all the known codes and instructions on how to redeem them, hit the link below.
While at West Edmonton Mall!!! this weekend I walked by a Microsoft pop-up store an they had two Xbox Ones on Display and were giving demos. I was able to play a couple races of Forza 5 and the dude next to me was playing Killer Instinct.
Forza looked amazing but at the same time it was just more of the exact same game. I don't know, it was great but not console selling worthy. (also I'm not sure why the rumble triggers exist, they were neat i guess?)
Killer Instinct looked extremely good player model wise but again, just seems like another fighting game. Nothing really new on offer.