Ok this kinda a dumb question all bands have bad days and good days I am sure even the great Jimi Hendrix sounded like crap a couple of times in his career and some people heard it once on that day and then said he was horrible and I know there are bands that are better than all of those bands that you mentioned that do not have any fame because they came out at the wrong time like now thaere are bands that have great drummers guitarists bassists singers that do not have fame because they are not pretty boys I am just saying there are some people real talent out there that are not known at all. And there are some bands out there that are famous that have minimal talent. But I am really into the older Metalica like everything up to the Black Album after that they still sounded good but not as good as they were. Also, AC/DC IS AWSOME!!!!!!!!!!!!!!!!!!!!!!!!!!