I saw Cradle during their Dusk tour, and they were horrible. They just couldn't reproduce the sound, and Dani had to use two mics to get the vocals going.
Immortal are fucking amazing live, though. Their first US show at the Jersey Metalfest got the lights cut early, which was sad.
Satyricon also suck live, but that's because Satyr shaved his head and started dressing like trailor park trash.
I have still never seen Manowar live. I'd really like to head over to Germany and see them.