I have seen this incarnation of the band nine times. I will say that I have noticed Augeri's vocals getting better as time has gone by. But, IMO, he has always had his struggles. Every show, it seems like, there are blown lyrics, obvious fatigue, and some screechy bits, to say the least.
For example, I don't think I've ever been satisfied with his vocal towards the end of "Escape." His voice just seems to give out on him. And I think I've heard him nail the word "night" in "Don't Stop Believin'" once. I remember thinking how obvious it was that the vox had been dubbed on the 2001 DVD because that part actually sounded right.
I am probably the biggest Journey fan you'll ever find, and I love the current lineup. So, if Augeri is not singing live, why do they NEVER seem to cover up the parts of songs where I always hear him go flat? To hear the accusations, the band has the technology to make every performance perfect. So, why don't they?