It is not him as a person that is the problem any more than it was Bush as a person that was the problem in the US, it's the entire party that is struggling, like many parties that have long periods in power, the rot has started to set in, the current Labour Government is starting to sound like the end days of Thatcher/Majors Government, where ministers keep slipping off the leash (in one unfortunate case, whilst wearing suspenders and with an orange in his mouth).
I can't really celebrate the blow to Brown himself, as such, since at the moment, we face the horrifying prospect of electing Conservatives at the next election, and frankly, I'd rather have a poorly run Labour.