I've been playing this since Wednesday afternoon, having booked them off work to play GT5, and thought I'll chime in with some impressions.
Since the opening of GT5, I've been struggling to focus my attention in any one area of the game. I have Licences to complete, A spec races to take part in, I'm continually drawn to special events as they're so diverse and exotic compared to the normal races, cars I want to buy in the dealers, a garage that needs sorting, GT TV has a special on Goodwood 2009 I want to download, Arcade mode is drawing me to rally races I've yet to take part in, I want more money to tune my GT-R '07 (That can beat any car I've tried it with) and it was only last night that I discovered photo mode. The game is so diverse, sprawling and polished, I just can't focus and I'm acting like a kid in a sweet shop.
I also can't find enough superlatives to do this game justice. It's polished, definitive, exhaustive and beautiful. Despite this, it's also esoteric, bewildering and ugly all at the same time.
Although I don't want to mention those lesser moments, they are there. The loading and install times at the opening of the game were bloody ridiculous, and even then, I was still hit by network issues and install times thereafter. Trackside detail is both wonderful yet on some tracks it's completely bland, lacking any complexity with stretched textures and plain details. The Premium cars are truly a thing of beauty, the best recreation of cars that I've ever seen in any videogame, PC or Console. But on the other side you have the standard cars which are relics of the PS2 era, some being faithful recreations, others being horrible looking slabs of polygons, with 4 moving wheels.
If those faults bother you then I can imagine you'll struggle or not even bother with this game. However, if you're like me and class them as chinks in the armour, or you're completely blind to it (And with those install times, you better be!) I can't think of one other driving game that comes close to GT5 that is so full of passion and content, it surpasses everything else I've played. With only 25% of the game completed, and a wheel stand pro yet to be delivered, GT5 is going to consume hundreds of hours over the following years. Absolutely brilliant.