N800 here.

I have to say, the DPad ranks among some of the worst i have used on a mobile device. This is mainly due to the fact that there is a great big button in the middle of it, which really tends to get in the way.

In addition, since the whole DPad is essentially one piece of plastic, i don't get any feedback as to which direction i am moving. Sadly not even the painted on markers help either.

I'd also like to add that the DPad going nuts and repeating the last direction issue adds to the frustration.

So to conclude, i would say that it is quite simply abysmal and ideally shouldn't have been put on the device in the first place.