A pipe thread is a tapered thread. So you are saying that Craftsman is bad because you ran the Tap in too deep? Before you read the instructions? If you were mis-using the finest tool in the world the result would be the same.
If it wore too fast take it back to Sears, they will replace without questions. It is fair to expect that it will not last as long as professional grade tools, you are not paying professional grade price.