Just to add to what Geoege said on "warpage", I learned just a couple years ago that what I was calling "warpage" was in fact bending that was the result of my leaning into the blade on the grinding wheel. Since I grind all my blades pretty thin, and taper the tangs very thin, I was actually bending them in the grinding process. If I took the time to straighten the blades before they went off to heat treat, they tended to "warp" less.
D2 is good steel. It does tend to be a little coarse grained though, and is thus more difficult to get to a very fine edge and it just won't take a very good finish unless you take some extra time to get there.