"For someone who's had the level of success I've had, there's been very little critical review of my work, which is pretty fascinating"

Billy Corgan is expressing his surprise at the lack of critique of his work in spite of his level of success. He is suggesting that he expected more criticism, given his level of success, and discovers it "remarkable" that there has actually been so little. This might be translated as a sign of respect for his work, or a lack of interest in it. It could also be viewed as an indication of admiration for his achievements, as individuals might hesitate to criticize somebody who has actually accomplished so much. Whatever the reason, it is clear that Billy Corgan is surprised and interested by the absence of critique of his work.