I love his voice! I think it's only gotten better with age, to be honest, and while he can't hit the high notes like he used to (due to recent down-tuning of older material), he still has a lot of soul and emotion in his singing.
His stuff with SB and TA, and his solo stuff, it's so good and his voice just bleeds and pours power and emotion. Anything with his singing on it, it's usually the first thing I pay attention to, despite who else is playing behind the singing, he's just that captivating to me!
-Marc.