As someone who has had just a little bit of involvement with this line of work, the problem is that in the last year or two, an authority might be granted sufficient funds to resurface perhaps about 0.5 to 1.0% of it's network per year. Well, the road surfaces don't last that long (design life of a new road is about 20 years before intervention, but as has been mentioned, materials are not as good as they used to be) so it is fairly inevitable that the roads will continue to deteriorate. Once upon a time, there was a much, much bigger budget to dip into, but this is not the case anymore.
The problem is this is compounded by ever increasing costs of actually doing the work, increasing cost of materials and increasing numbers of vehicles on the road that further accelerates the wear. Add into this equation the last few hard winters, and it's really not surprising that we're seeing the deterioration that we are.
Temporary repairs with cold material will only ever be a stopgap to some proper patching, but if the structure of the road is suspect then even this is only a temporary repair until a full resurfacing of surface, binder and possibly even base course is required. The latter costs a LOT of money!
It's a royal PITA, I wish there was an easier way, but unfortunately it's another aspect of the country's infrastructure that will continue to suffer while we are in this economic dip.
While we're on road surfacing btw, the 'sprayed on chippings' (surface dressing) might seem very messy and ineffective, but it's actually a very cost effective way of sealing up a tired road surface - expect to see it used much more to try and hold together those roads that are on the brink of breaking up.
Hope this info helps to put people in the picture a bit more.
