I like this game, but it's pretty challenging. Even after you memorize the tracks, you still have to contend with the obstacles and hazards which are kinda random in that some hazards float around the track, not to mention that some tracks erode the track in subsequent laps to very narrow lanes that can be nearly impossible to navigate consistently. And there's no rubber-band AI in this game either, you screw up and you will lose. It definitely takes some getting used to because the controls are a little floaty. I had to do the first GP quite a few times to get the hang of the controls. Don't forget about the drift ability using the shoulder buttons to gain a speed boost.
About those hazards.....do yourself a favor, go into the options and turn "Auto Hazard" to ON so you won't have to hassle with deciding the useless hazard placement silliness. Believe me, it makes the game flow along MUCH better when you don't have to bother with placing hazards before EVERY race.
One thing I wonder is what happens after you beat all 8 GP's? I mean, according to everything I've read about this game, it has 48 tracks, but each GP is only 3 tracks. 8x3=24....so where's the other 24 tracks? After beating the initial 8 GPs, do 8 more open up? Do they just mirror them or make you race them backwards? Has it got something to do with multi-player mode? (I don't play multi-player modes in games) I don't know.......but it keeps me playing to find out.