I've been playing this game for a few months now and I can honestly say I have a love/hate relationship with it! Some days I can drive like a master (with the DFP of course) and beat the Richard Burns Challenges, other days I can't drive for $@%^ and it pisses me to no end.
If you are using the DFP I would recommend trying something to improve your driving:
If you are using 450 degrees steering (default setting on ps2) the sensitivity is normal because you are using 504 degrees of steering lock (as set in the car setup screen) over the 450 degrees of DFP wheel rotation.
But if you have set the steering to 540 degrees to simulate the wheel rotation it becomes a lot harder as you're controlling the same amount of steering lock over more wheel rotation, so to compensate set the steering lock to 605 degrees in the car setup, then you maintain sensitivity while achieving more lock if you need it (easier for scandinavian flicks, hairpins etc).
That said, I think the game is extremely unforgiving , especially when hitting potholes and bumps. Sometimes it seems as if hitting any object will cause the car to immediately pivot around it as if it's stuck to it with glue which seems a bit crazy.
A lot of unnecessary difficulty occurs because of the in-game views, they dont give you a good enough sense of judging distances in front of the car and if you brake a little bit too late it's all over.
I also find it difficult to gauge how the accelerator works eg. press it in a little bit in 1st gear and the car rockets to ~60km/hr and just stops without even reaching full revs, then hit second without changing the accelerator input and the car jumps forward to a higher speed again and just stops. Is this incorrect or is that how the turbo boost actually works in a real rally car?
Also with the DFP, the force feedback can be a bit much after several hours so I have found 60%FFB at the wheel and 60% "force feedback strength" in the options works best (feels weak at first but is more comfortable over several hours of intense play.)
Also this game tends to knacker the DFP a fair bit as you're constantly sawing the thing around (not so much if you're driving well

). I have found applying synthetic grease to the nylon gears works best for protecting the gears and smoothing and quietening the gears. Auto lubricants like WD-40 and RP7 also do a good job but are more dangerous to use as they are a liquid and can find their way onto the circuitboard!