Instruct: Classify Amazon reviews into positive or negative sentiment
Query: beware these cookie sheets

the cookie sheets were on back order and took a long time to come in, I don't know if I got the same product that everyone else got, but each time I tried to bake cookies on them, the cookies would burn on the bottom in only 2 minutes at 350 degrees. (after 3 attempts, I gave up, this never happens with any other cookie sheets) Will never use them again, big disappointment.