when did they fail? the just changed tactic... they brought down the PSN three days in a row... as well as playstation.com and Sony's official website. I mean are you saying they should continue to bring down the PSN? I'm sure they will change back if enough people ask them too because of their apparent failure to continue to do so..............
Personally, I wouldn't change tactics if it were working. What's the point in taking something down if it goes back up again? Sounds like they could not keep it down so they had to try again. Just like the old say, "If you don't success, try again." They tried two more times because they didn't succeed to keep the network down. So they stopped. Makes perfect sense.