but if we're talking about skills or artistry I don't really think there's anything special about him. But then again that's just me and my opinion. No disrespect to his fans or whoever.
My opinion - I'm impressed with his vocal power. Walk the streets of Manila - heck, check out all the male pro singers we have - and see if you can find someone who can sing like Steve Perry - who can hit melodic high notes without resorting to falsetto. I'm not a real Steve Perry (or Arnel Pineda) fan, but that voice has to be one of the most powerful, expressive and melodic in pop/rock of the last few decades.
On the accent - his is neutral, as is most Filipinos - the reason why the Americans like us a lot for call center applications (compared to US southern, latin american, Mumbai, etc).
What really bothered me was the diction. One example - how he sings "Separate Ways" - my favorite Journey hit and the first song on their set. When he gets to the word "touched" - a high point in the chorus, the tension which leads to the resolution on the next line - he pronounces it as "tats".