I never liked GT4, I was extremely disapointed with the driving model. I prefered Forza as a console game.
I'm fairly impressed with GTL. The game has it's flaws, like everyone else, but the driving is a lot of fun. You can feel being in the car, with it's strenght and weacknesses.
The alpha race was online, as well has the Falcon race and the Beemer.
NUR was imported from GTR I think. I was quite impressed by it's fairly accurate represenation. I haven't put my hands on the 906 yet. I love the car, but I spent most of my time with the 65s. The 76s provide less driving excitment to me, even if they are much faster. So far I run in 9:20s with the 400HP CLS, I saw 8:30s with the 906/Capri/Pantera.
BTW, in LFS, first OWRL season race is on Saturday.
Best $20 I spent since my first crack ho.