Originally Posted by Unknown Soldier

That's because his Montrose albums were back in the early to mid 1970s and by the time he sang on the VH albums, Hagar already as a solo artist had covered quite a bit of ground and developed as an artist, and so when he joined Van Halen they were an extremely commercial band and he was just adding to this rather than changing anything. So I'd say with or without him the 5150 would've been a completely commercial sounding album anyway.