Sad Wings of Destiny, Stained Class, Sin After Sin, Killing Machine, British Steel, Screaming for Vengeance and Defenders of the Faith are "pedestrian"?? All the songs in those albums have great solos by Glenn Tipton and KK Downing and they're all certified classics.
They have influenced countless of metal musicians including the guys in Maiden.
Rob's vocals back in the 70s and 80s were insane, so I don't know how you can think his vocals are not on the same level as Bruce.
He's always considered a top 3 metal vocalist along Dio and Bruce.