It's not a bad thing if you're guaranteed to buy the game no matter what. No judgement, for some people that's the case and that's fine. But it's not for everyone.
It is a bad thing if you want to see whether the game might be right for you first. I'm not dropping $60 on a random game unless I'm really sure I'm gonna like it, and my last couple of experiences with GT (and their massive change of direction) have me doubting that this time. I will gladly sacrifice the thrill of the unknown for some solid pre-release information.
This isn't even getting into the fuzzy area of limited info only really being of benefit to developers, specifically developers who have developed a game with issues but still want to cash in on those early sales before people find out it's a dog. Not that Polyphony is necessarily in this category, but it's become a common thing to be very suspicious of any game that doesn't have pre-release copies for reviewers.