Interesting debate happening here. I think there are some things to establish or keep in mind.
Is the debate about whether or not he can play, or whether or not we like/dislike him? I think for anyone who's ever heard Julian, the former argument is a futile one. He CAN play, better than I probably ever will and he's a good seven years YOUNGER than me!! If this argument is about tastes, then that again is futile. We can beat each other over the heads with the same arguments over and over but I think it's pointless to try to change someone's opinions.
I guess the point I'm trying to make is, let's decide what we're arguing about; in other words I DON'T LIKE HIM shouldn't necessarily equal HE CAN'T PLAY. Take this for example:
Can he play: Absolutely!!
Do I like him: No not particularly. A lot of time I feel he plays notes just for sake of playing notes, i.e. "how many notes can I squeeze into the measure." At times I find it to be unmusical.
Now bear in mind that I understand that these are MY opinions. Do I take anything away from Jimmy? ABSOLUTELY NOT!
Do I think people will disagree with me? I hope so. I'd find it very boring if everyone agreed with me 100% of the time.
Anyway, that my two cents.