Thank you so much for reaching out, I am sorry to hear you are not pleased with your new kitchen sink, but I think I can alleviate some of your concerns.
The stains/spots you are noticing are not part of the stainless steel; they are deposits on the surface of the sink and can be removed with cleaners containing oxalic acid. Unless pure distilled water flows from your faucet, there will be dissolved minerals and salts in your rinse water. With proper cleaning and care you can remove what you are seeing.
Also, Scratches are inevitable in any sink material, including stainless steel. These are merely usage scratches. Overtime, these scratches will become uniform with the sink's grain and blend into the overall finish of your sink with proper cleaning. Most minor scratches can be softened with a fine (white) 3M Scotch Brite pad, or 3M Scotch Brite Natural Fiber Non-Scratch Scour Pad, accompanied by a deep cleansing agent such as Bar Keepers Friend.
The surface scratches which appear on stainless steel sinks rarely have any appreciable depth and will become less noticeable with age. Your sink will look better a year after installation than during the first few months of use due to the fact that the scratching will have evened out. All sinks manufactured in stainless steel perform in exactly the same way.
Please contact our customer service at 1-800-775-0703 or customerservice@kraususa.com if you’d like to continue the conversation.