Love this game! I keep thinking "I haven't liked a motorcycle game this much since Superbike 2000". I just realized the two games had the same developer. I'm sure there are a lot of different people at the company now, but still, it seems like there's some similar DNA between the games.
I don't really understand some of people's negativity towards this game. I guess maybe it doesn't feel simmy enough for the sim enthusiasts, and not arcadey enough for the GRID and MX vs ATV crowd. I, however, love the balance. The menus are beautiful, lots of good multimedia content that gives it more life, lots of game modes, love the Moto2 and Moto3 options because MotoGP is pretty intense for a starter. Great control/realism options (I like joint-braking and auto-tucking because I don't need THAT level of simulation). I think the graphics are great personally. The player models are particularly good I think, and the tracks have a lot of spectators and a good lively feel to them, although they don't quite have that GRID polish and detail, but I don't really care for that look. This game is clean to look at and not cluttered.
People have complained about the controls being unrealistic, but I don't see what the problem is. I loved MotoGP 07 which actually felt a little too arcade-like to me, but I like this game much more now that I've tried it. The camera is more stable and improves gameplay, and I like the way the bike responds to over-throttling it. High-sides and low sides seem to occur reasonably, and if it were any harder or sim-like, it would be a pain to play (using a controller with joysticks will never perfectly reproduce the feel of a real motorcycle and people need to accept that. So why not make a game reasonably PLAYABLE? I think this game is, yet isn't a silly arcade game either).
The wreck physics are a litte silly though. You can bump into the back of people and flail around over the handlebars and easily recover. It's easy to maliciously wreck other people too. But reasonably trying to race among a large pack isn't impossibly difficult. But it's a challenge. I think the wet conditions LOOK nice in this game, but they don't seem to affect control very much at all, so that seems a little unrealistic.
I tried MotoGP 14 first and my video card struggled, and it seemed glitchy as hell. I actually prefer the cleaner look of MotoGP 13 anyway.
I think Milestone did a admirable job with this game and I'm happy with my purchase.