Funny, At the time you posted this I was like no way because I kept thinking of Bruce now that he's older and cant sing like his younger days.
...but lately I've been listening to ''Piece of Mind" and you're right. I forgot what a awesome singer he was back in the day!
When I first heard Number of the Beast, I was a youngster and was absolutely blown away by Bruce... From then until probably Fear of the Dark, I thought he was just the best thing I had ever heard.
His Accident of Birth Album was also really good, but yeah, today, his voice is just older and run down, it's not his fault, dude is gotta be pushing 60 by now.
Age gets us all.