Long Answer:
As with all games, there will no doubt be some aspects of GT5 that people think could be improved. There will never be
one single perfect racing game which we all play in bliss until the end of time (nice as it is to dream of it!) - it's just not going to happen. The different series of racing games will continue to differ and provide different things for people with slightly different tastes. An unfortunate downside (if there is one) of having a series as big as GT is that the expectation with each iteration from reviewers and the huge fanbase alike must be a little overwhelming! On discussion boards like these, with so many fans of the game waiting for literally years for a game to come out, it's inevitable that some people's expectations of the feature set just continue to grow over time and become more than a bit unrealistic. That's my opinion but only time will tell!
What's most important to me is that PD seem to be a group of pretty hardcore petrol heads and game development experts that are on a mission to build the sort of game that
they would want to play - and if you want to make great games (regardless of the genre), I think that's the best place to start. If you're genuinely passionate about what you are creating and you are still excited about playing it yourself when it's years into it's development, that's a pretty good sign! Obviously there is interest there in what your competitors are doing but if you worry
too much about their set of features, it's very easy to lose the core DNA of what made your game so popular in the first place.
Any person or group that follows their dream by setting out to make flawless fantastic games and not just talking the talk regarding quality but is prepared to put their money where their mouth is and take a risk in some respects by delaying a game in order to make sure that at it's point of release (not months/years later after following countless patches) it is the best it can possibly be - deserves a big pat on the back for at least setting about their mammoth task with the right intent and mindset.
Short Answer:
GT5 will not be the single perfect game which will lead the entire human race in unsion to the motorsport promised land. However, from what I've seen so far, I do think that it will be a great game. Will it be well recieved by reviewers? I'm not sure, I think probably most of them yes it will be. Will it sell well? I'll be very surprised if it doesn't! Am I still looking forward to it with so many other racing games across all platforms (including PC) on the market, hell yeah!