Not bad but the lack of US/Japan sales will hold it back from reaching the lofty heights of previous GT's unless Sony start bundling the title or advertising the new version a bit to make people aware of it again.
Would I be right in saying the franchise is showing growth in Europe/Asia but dropping in US/Japan? US is probably due to the big drop in install base for PS3 vs previous Sony consoles plus maybe a growing lack of interest in the genre.
Try to be reasonable... its easier than you think...