There are some issues but the game is far from broken.
The pit crew are far too cautious when releasing your car. This isn't an issue in longer races and is easily avoided by changing your pit stop lap on shorter races, to avoid coming in at the same time as everyone else.
Some folks complain about the AI cars resetting after an accident but I really don't understand why that bothers them so much - I've seen it once in the 1st season I completed.
If you like F1/racing, buy the game. It is great fun.