I'm sorry you've had issues, I would indeed send that knife back if it were me. I don't think that the lockbar not being perfectly flush when open is a huge deal, but I don't fault you for your standards if it bothers you. I'd just remind you that even if you bought 100 knives you'd still be getting a fairly small sample of what the Japanese Spyderco plants had to offer, much less Japanese manufacturing in general, so your experience is far from conclusive. It is your experience, though, and will obviously color your buying decisions in the future.
If you were to buy from some of the smaller retailers (Howes, Knifeworks) I'm sure you could get them to inspect your knife prior to shipping if you described your previous experiences with this model. There are other good ones as well, those are just two I feel confident in recommending.
Thanks for sharing your pics and experience, though, it is sure to be helpful for other people interested in the Ulize. Also, it may very well be that there are consistently problems with this model, and Spyderco is more able to determine that with details and pics like you provided.