We've had rallying in Gran Turismo for nearly 15 years now, and while it's always been pretty novel, I think it's about time it became a serious part of the game. Considering all the effort PD went to in order to secure the WRC license for Gran Turismo 5, the rallying portion of the game is extremely disappointing.
I think GT6 would benefit massively from having proper point to point stages either designed by PD or based on real life (Pikes Peak!). Then have five or so of these stages make up a full rally. The randomly generated stages in GT5 are, quite frankly, laughable - they look bland and the AI cars usually have no idea what they're doing and offer no challenge.
Rally courses in GT5 are all too often just road courses with dirt on them. By this I mean they are too wide (to make up for the lacklustre dirt driving physics) and offer no real sense of danger. This onboard video of Richard Burns demonstrates perfectly how an actual rally stage is:
http://www.youtube.com/watch?v=oYxqbcKFryc
Tight, twisty and difficult. If PD could capture the actual physics of rally driving, along with the sense of danger (that means proper mechanical damage and no more barriers - if you go off course you should actually slam into that tree or career off the side of that cliff!) it would greatly enhance the GT experience. It's about time PD got rallying right, as it's looking increasingly likely that FM5 will feature offroading.
A better selection of rally cars would be nice too. Whatever happened to that premium WRC Impreza from GTHD anyway?