I had the same problem with my g0704 (not as bad) having unfinished ways as well. On my machine the Y axis was properly ground and so was one side of the x axis though. I wouldn't have been sure that I wasn't just expecting too much from a low cost machine if it weren't for the fact that I could clearly see and feel the difference between the ways that were ground and the ways that were completely neglected.
I had a different experience with Grizzly customer service though. I didn't complain about the ways because I always wanted to lap them anyway, but I did write an email to customer support last week (complete with pictures for evidence) letting them know about a crack I have had in the headstock since I received it about 1.5 years ago. I originally mistook it for a mere crack in the paint until recently while I was trying to track down the source of the vibration problems my mill has with even slightly demanding cuts and I noticed that the crack appeared to have grown larger since I first discovered it. I took another look and it appeared that the crack was going through to the other side of the casting and was more than just paint. I told them that I knew it was out of warranty but that I didn't report it at the time because I had hoped that it was cosmetic when I first discovered and also because there was a waiting list about 6 months long for the mill back then and I didn't want to have to wait again for a replacement. I expected a "sorry, you should have said something sooner" but they actually offered to replace my entire out of warranty mill if I would pay for return shipping. True, the crack in the casting was a factory defect that crippled the mill and because of that they should really replace it at no cost, but it is out of warranty and they don't technically have to do anything for me so I appreciate that they are. The fact that they offered to send me a whole new mill instead of just replacing the broken part was especially surprising.
What they did to you Wheelie is wrong. I'm sorry that you didn't have an experience with their customer service more similar to mine. I think that your warning is fair and something buyers should be made aware of. You may have a great experience, many people do and really enjoy their machines. Some people do not though and end up with 400 lbs of problems. Know what you could potentially have to deal with if you are considering taking the plunge. Grizzly support seems about as consistent as the condition of these machines when they leave the factory. Sometimes good, sometimes very bad. Consider that as well when contemplating your purchase.