It's a lacklustre console port. If you can get past that then please feel free to read further.
The game is 'good' and probably the best bike racing simulator I've played, and as a biker I buy them all. The physics engine is generally pretty decent, the bikes themselves are faithfully modelled and of course its nice to have the Dorna permissions to include the full roster of teams and rides. But that's it.
The game is built on a clearly dated engine that has reached, if not passed its end of life cycle. I'm playing on a fairly competent machine, i7, 16Gb, GTX670, SSD and the game performs poorly with frequent stuttering. Garage scenes are particularly ugly with massive screen tearing and corruption when selecting the bike to confirm which developments to complete. Very poor.
Racing is generally good. There's a decent sense of speed and simulation going on though the sound of the bikes is pretty off. AI is generally perfunctory at best. They ride and do what they're supposed to do though have no real character; you can certainly tell that it is algorithm riding the bikes.
However the biggest negative is the startling fact that this is a poorly optimised console port and Milestone hasn't done anything to even attempt to hide this fact: No graphics options, poorly optimised UX (for PC), No way to Quit to desktop(!), no way to save custom controller configurations...
Milestone don't tend to patch their games. I don't expect any of these issues to be addressed.
End of the day I waited until the game was on sale before buying as I'm fully aware of Milestone's track record and history with respect to their games and support there on in. I paid GBP 14.99 and feel that I have a fair value for money at that price proposition.
Summary; it is a 'good game' for an unambitious console port with the usual trappings of what that entails. Don't buy at full price!