Great game. It offers a great sense of realism and really challenges your abilities while still being great for any beginner. Not that I need to mention it, but the graphics are quite amazing as well. Sounds are okay. They aren't the best in the world, but they will do. The career mode is fairly in depth and you can tweak just about every setting on your bike which is very nice.
The only issue I am experiencing right now is the sound cutting off about 30 minutes in causing me to restart the game (onboard Realtek 7.1). I experienced the same bug in the demo. I still definitely recommend the game for any enthusiastic racer.
UPDATE1: There is one thing that absolutely BUGS me about this game and it totally kills the realism for me. Devs, if you are reading this, please for the love of God FIX THE START GATE! This whole "ready, steady, start" crap is so annoying. You guys just need to make it where you get the 30 second warning board turned sideways and just drop the gate randomly (2-10 seconds) and if you go too soon you get stuck at the gate. This is not a game killer for me, but for a game that is striving for realism, I can't believe you guys could mess this up.
Also, a possible workaround for the sound bug for me seems to be changing the "voices number" to 32 instead of 64. So far it is working, I'll update this review if I discover that it didn't fix it.
UPDATE2: Changing the "voices number" did not fix the problem.