I'm like half way in the game. It kinda disappointed me a little bit, but that's just when I try to compare it with the two previous games (I love them), which is something inevitable.
However, I have to admit that it has a lot of good and fun elements, but the most remarkable one is the fact that the game makes you "think" a lot in how to build a perfect vehicle.
Of course what I've enjoyed most in the game is this:
That's the best game ever, there's no doubt about it