Alright,
I finished all the licences in about 5 hrs and was a touch disappointed initially to discover that this was basically the whole game. I thought there was going to be at least some normal "Gran Turismo" modifying, racing in it but it seem not.
The MAIN challenge of this game is going to be getting all golds in the licences - I can see by the empty spots in the arcade garage that there are still more cars to come obviously from winning all golds in the 5 licences plus another for all gold in the coffee breaks (those things suck ass!) I initially thought you were going to get the extra cars from getting a certain number of "points" (There is some points total for no apparent reason) but I now have like 17 golds so Im thinking it has to be for getting all golds in each licence catagory.
I think the 5 courses are awesome, cars handle really well but on some of them (see R34 GTR) the gear changes SUCK (must be that crappy getrag gearbox! haha!), the rallying is much tougher, and the whole if you hit another car you lose thing really teaches you to drive better.
Getting some of the golds I can see as being near impossible so thats my only concern (like getting past the spoon s2000 in NY in one lap!). But overall I've come to appreciate this game for what it is - but I think a lot of people are going to be disappointed until the real GT4 comes out.
And James - still no M5 concept yet