If you take this guy to court over warped doors you may be disappointed with the results. No cabinet door company I know of warrants Cabinet doors to stay perfectly flat. Most warrant within certain tolerances. No cabinet company I know of will ever warrant doors 42'' or taller. Below are a couple of links to cabinet door companies warranties . I believe most door companies will have similar warranties. If the contractor presents these warranties to a judge as the norm in the door business I doubt he's going to rule in your favor.
That being said, I believe you have some legitimate on some of the other deficiencies and workmanship.
http://www.advantagecabinetdoors.com/product-warranty/
http://cabinetdoorstore.com/ecom.asp?pg=warranty
Rich
ALASKANS FOR GLOBAL WARMING
Eagle River Alaska