Some are really awful, but some are actually quite good.
When I bought a new notebook last summer, my first concern has been typing comfort, and the only one I found really satisfying was the Thinkpad's x100e. The keys are slightly curved and comfortable under the fingers, and the press does not have the rubbery feel that is shared by much laptops (yes, Sony, I am looking at you). True, the battery life is the x100e is, at best, shitty, but that was a trade-off I was willing to make. Add the trackpoint at the center of the keyboard which is IMO far superior than the touch pad as a pointing device for casual use, be cause you don't have to bend your wrist to reach it.
I actually prefer this keyboard to the one Dell ships with their desktops, and that I had to use at work (company policy...)
Disclaimer: typed on an x100e