He knows how to write catchy pop songs that are easy to listen to and appeal to the public, so I suppose that's a talent in itself. His songs are memorable but typically play too safe.
Some of his earlier songs were good, but his production started to grow repetitive, bland, and simplistic as his career progressed, typically recycling the same production choices and formulaic arrangement. As a producer, he is not very creative or unique.
Some people legitimately hail him as the best producer in K-pop... He is likely the most well-known with songs that top the charts, but certainly not anywhere close to the most skilled.