Dirt 4 is more of a simulator unlike Dirt 3. In Dirt 4 the handling is much more realistic, the routes are quite narrow and it can be very difficult to not crash and still get a good time. It is much closer to Dirt Rally than it is to Dirt 3. There is an arcade mode if you're looking for something slightly easier but I have not tried it. Dirt 4 also has a very nice Career system, which allows you to do more things than in previous games, such as create your own livery, add sponsors etc. The sounds are amazing and the particle effects are also really nice. There's also many other improvements to the weather system, AI etc. as well as the addition of a rally stage generator.