As a band, old Accept is a far better band than Hammerfall. Udo's solo stuff is good too, But It's just that I don't think he does the material justice anymore. it is played a whole step down which results in a lot of gargling bottom falsetto sounds. That new guy delivers the goods. That being said, I thoroughly enjoyed his latest album with the musik korps, but not because of his current voice rather, despite it.I'd probably enjoy one of Udo's farts more than Hammerfall's music, but each to their own.
Joking aside, it would have been a nice opportunity to hear those Accept classics once again sung by their original vocalist. Udo is the voice of the albums that - to me - epitomise heavy metal.