MotoGP 13 is a great game and a massive improvement on the last MotoGP game, MotoGP 10/11. The biggest improvements have been the career and handling. Career is now a far more immersive experience, in which you can join existing teams and be team mates with the actual riders. Although you cannot create your own team anymore, I much prefer this format, and I think it is something that will suit hardcore MotoGP fans. Next, the handling. This is has been a large problem in all Motorcycle games created, because it is more difficult to re-create the physics of a bike than a car for example. A large step forward has been made in this game I believe and, however hard some people may find it, it is much, much better and more realistic.
There are a couple of cons that mustn't be forgotten. The frame-rate is particularly bad on certain tracks, and can get quite annoying. The game can only manage to include 29 bikes on track at the same time meaning that there isn't a full grid in Moto2 and Moto3. It is very easy to level up and unlock most things before you have even got into your second full season, and practice, qualifying and warm-up times are pre-set, meaning that the times you see AIs doing on track are very different from those they set. Other problems in these sessions include massive gaps between riders that shouldn't be there, such as in Moto3 Maverick Vinales, Luis Salom and Alex Rins will usually be 1 second ahead of everyone (apart from Jonas Folger), and you may see your team mate coming out of a different garage to which he/she is in.
Overall MotoGP 13 is a fantastic game and I heavily recommend it, but it does have some hiccups. It is a little like when Codemasters made F1 2010. It clearly has a good concept and vision, but needs time to clean up the bugs and glitches. Brilliant nevertheless!
(By the way Xavier Simeon's and Julian Simon's 3-letter abbreviations are the wrong way round.)
(And I support Dani Pedrosa!)