He is amazing because of the creativity, and despite the fact that dir en grey is a band with a very different, versatile and unique sound, he is still able to follow it perfectly, and not simply follow it but create such unique and unimaginable sounds.
Shinya is a wonderfully talented drummer, and I always get this distinct feeling that he is much more emotionally complex than he lets on [not that he lets on much; the guy doesn't open his mouth!] and sometimes his drums are so powerfully emotional it drives me to tears; he should really be more confident of his skill...
Although I think its adorable that he's so shy and modest when he could show off like crazy about EXACTLY how good he is at his job...
Shinya goes all out when he's playing drums