Moto GP is an arcade style racer through-and -through.
The handling and dynamics are not in anyway realistic, and the 4 stroke engines sound totally unrealistic (Moto 2 & Moto GP).
But..... the sound track is great and once you realise the name of the game is not trying to 'man handle' the bike but in fact stopping, turning, clipping the apex and accelerating out, it becomes a lot more fun.
The 125's and 250's are also a lot of fun, and essential to the experience of the game.
I don't play online so can't comment on that, but the 5 minute format for races/qualifying/practice for a solo player is ideal.
You'll be a world champion in no time!
Great addition if you're a bike fan, but be warned: if you play another game like SBK and then go back to Moto GP it'll take you ages to relearn the dynamics of the game.
Worth 10-15 quid but SBX10 is the daddy of motocycle realism (so far).