Can you post a picture? If "all the color" came off that sounds a little excessive but some wear there isn't unusual - especially along the edges. If there is a deep scrape down the center or something like that there may be a burr on the slide or something. Close examination might be in order. BTW, did you clean the gun before shooting it the first time? That's always a good idea with any new gun as there can be tiny bits of metal trapped in gunk.
Anyway, bluing is cosmetic (and a barrier against corrosion, of course). The real test is if the gun functions well and shoots reasonably accurately. I'd put a couple hundred rounds through - if you have no malfunctions during that time and the accuracy is decent I'd say just clean the gun after each session, put a very light coat of gun oil on the barrel to prevent rust, and live with it.
I have noticed that the bluing on my LC9s is pretty shallow all around.
John