When I ordered my kit I also ordered an extra $35.00 stock. The extra was basically like you described. I stripped it and sanded it. Still haven't put finish on it.
The stock that came with my kit is walnut and decent. It's no looker, but that's ok. Lockup is fairly tight.
You may consider calling them. If it was the $35.00 replacement stock that came like this (which was my case), I don't personally don't think there's any real way to take issue with it - you get what you pay for. But since this was a part of your $600.00 kit, I would probably recommend emailing customer service.
Emailing them will always get you fast service, they're great with emails. One time I emailed, didn't get a reply back, but actually received the part two or three days later. They're pretty incredible with customer service.