さだまさし
His MC segments are just too long. He talks about ON (Oh Sadaharu and Nagashima Shigeo), Tsubakuro, and the Swallows (Yakult Swallows baseball team). He also discusses cultural figures. I'm here to listen to his songs, not a lecture. I came to hear a concert, so please reduce the MC time and perform 3-5 more songs. I won't go again with this structure. The large-scale band arrangement is also a waste of talent. I'm never going again.
Source: Wikipedia