I enjoyed tainted. It reminded me of some of the books by HM Hoover and Monica Hughes (though written for an older audience) and I had a great time trying to work out what the 'taint'. I will admit that the reason for the taint was not what I had considered, so I give the writer lots of kudos for that.
I thought the main character had great potential despite her disinclination to actively find stuff out until the last 3rd of the book. Some of the secondary characters needed more expansion but I do accept that we are in the head of a teenager.
My main issue with the book involved the romance(s). Yep...love triangle off the starboard bow.. And like most triangles, it seems written just because the writer wanted one. The romance is the weakest part of the book and I didn't think it was needed.
All in all, a great read and I am definitely getting the sequel.