I know my British friends will probably just look at me like I'm insane, and I in no way say this as any kind of approval or dismissal of his actual performance as PM, but y'know?
I frequently feel really sorry for Gordon Brown.
It's probably just that he looks so pathetic, and he does all these dumb things, and rather humiliating things happen to and around him (probably mostly of his own making), and he fumbles around, and everyone around him is falling apart, too, and it's just quite embarrassing. So I feel sorry for him.
Come on, you have to admit he does look like a very sad bloodhound.

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Now Tony Blair enjoyed being PM and stayed on longer than intended which riled Gordon and his allies began pushing for TB to name a date when he would stand down. After leading Labour to an unprecedented third term in government Blair finally did relinquish being PM and Gordon became Labour leader and Prime Minister by default.
The problem is that since Gordon has floundered from one PR disaster to another, dithering over calling an election and finally deciding against it, one that he would almost certainly have won. Alienating a lot of his backbench MPs by pushing through a tax cut that actually hurt the poorest workers the most, and then having to climb down and compensate the losers. Woefully misjudging the public's anger over the MPs expences fiasco. These failings have been made worse due to the Conservative party choosing David Cameron to lead them, a man who is straight out of the Tony Blair mould, a slick decisive communicator who is running rings around him at the moment.
To me the big problem is that Gordon Brown is a man whose skills were ideally suited to working on policy and the economy but lacks the essential comunication skill necessary to lead the nation. He alienates colleagues with his heavy handed actions, lacks a connection with the electorate and seems to stumble from one self inflicted crisis to another. An example of this was when Lib Dem's treasury spokesman Vince Cable said that Brown had a "remarkable transformation in the last few weeks from Stalin to Mr Bean," poltical insults do not get any more damning than that.
He is a man who for most of his life has wanted to be Prime Minister, but when he gets there he finds that he is unsuited for the job. "Be careful what you wish for."