I couldn't agree more with the last reviewer, at least someone reviewing this game has a brain.
Read the title: 'Moto Gp 2006'. Why on earth are people expecting all-out arcade? Do they even know what the Moto GP is?! "Ooo, it's got a bike on the front cover, it must be a bike arcade game." Wrong, wrong, wrong. Honestly, if you're not going to actually learn about the game's features before buying it, it's like going on a blind date. You're just wasting your money.
On a good note, I personally love this game. I've played in recent months Tourist Trophy by Polyphony Digital (PS2) and was very pleased as I am very familar with PD's Gran Turismo series. It's quite a jump going from GT and other car games to your first bike game, but this is one game I can't take out of my 360!
Playing for a few hours now, I do believe this is probably my favorite bike game I've played and love games with simulation.
So, here's a note to those who can't be bothered to research and learn what the game is about: All the riders and tracks (as far as I can tell) from the 2005 and 2006 Moto GP are thrown into this game, with excellent (realistic) physics and, yes, it is tricky to begin with, but in time you do learn how the different bikes, riders and tracks are different and how to compensate accordingly. In other words, you do need practice at this game , in general, to get better at it. Common sense really :)
Graphics and content are as expected: tip-top and better than other games in it class. This is a game for Moto Gp fans and, to some extent, motorbike fans. Just don't expect 'unrealism'. Buy away!