I agree they can be annoying, but teaching that all and every use of carousels is devastating to your business is careless and wrong. All of these very profitable companies use carousels and probably laugh at the short-sightedness of this sentiment.
http://www.amazon.com/
http://store.apple.com/us/browse/home/shop_mac
http://www.rakuten.com/
http://www.ebay.com/electronics
https://www.youtube.com/
http://www.microsoft.com/en-us/default.aspx
etc..