Haha, not really. He plays fast scales but they're sloppy and his bends and vibrato are terrible.
I completely agree.Jani was much more melodic and tasteful prior to Reckoning Night. From there forward his solos began to be more about playing fast and less about melody. In their prime I would rank Alexi and Jani pretty evenly. Neither of them are notable for their vibrato, but honestly I don't consider that to be a very big factor in ranking a guitarist, least not in the realm of heavy metal.
Sloppy?
http://www.youtube.com/watch?v=dz3hpwKTB3I
Just look his picking technique, beats Alexi anytime. And I love that vibrato. Got a lot of feeling in it.