I'm not a Blair fan but there ARE positives behind his career. He's redirected the Labour party completely, and he must have done something right after all to have stayed in office for ten years. There's been the Human Rights Act, Freedom of Information Act, attempts at Lords reform, minimum wage... the list goes on.
I think it's all too easy to criticise him particularly with all the negatives recently, but he's had to face things which haven't happened to this extent before - 9/11 and the increasing terrorist threat. ID cards and the like are all criticised, but can anyone say that any other party - even if they oppose them all now - would have acted any differently? Chances are whatever they'd done we'd find some way of criticising it anyway. He hasn't had it easy and maybe, just maybe, he's done his best to sort things out.
Saying that though, recent events are going to dampen any legacy - cash for honours, Iraq war, increasing rebellions... there may be some legacy but for the most part I think he's going to be remembered by critics for all of this.