Depends on the product, and who defines "good." The back end of most big products you use (PayPal, eBay, etc) are probably pretty "bad" from an objective back e

Depends on the product, and who defines "good." The back end of most big products you use (PayPal, eBay, etc) are probably pretty "bad" from an objective back end engineer's point of view, but they're "good enough" to deliver the product. Meanwhile, problems in the front end are more immediately felt when using the product.