It says that he has grade 8 in classical guitar, piano and singing, which is more than most of my favourite musicians have. So why isn't his music more interesting and enjoyable? He has succeeded financially I suppose.
Being technically competent doesn't necessarily mean you are creative and will make interesting music. There's plenty of songwriters who may not play their instruments that well, but are able to come up with something original. I assume getting to Grade 8 in an instrument requires lots practice rather than natural ability.