This game proved to be no simulator, and I believe no patch will be able to fix this. The graphics engine is terrible!
For a game that calls itself a "simulator" you would expect a good physics engine, that kind of showed what driving a bus is all about... I've driven one in real life and it definitely, ain't nothing like what they've put in game. One tap on the steering and the wheels tilt to their maximum, wether the bus is stopped or going full speed. They brake way too fast, and accelerate faster then they should. There are no collision effects, you just crash and that's it. At least on Bus Driver there were screams from the passengers!
Last but not least, the sound: completely useless, you can play the game with your speakers turned off. It has absolutely no resemblance to real life busses, no turbo sounds on high rev's (you can't even see the rev's!), the busses don't "kneel" and there's no air sound from te suspension or brakes.
My point: if you already bought the game, well I'm sorry for you... If you haven't bought it yet, don't bother doing it.