So many people are far too opinionated about this to take a realistic approach...
She stole our milk. Bad.
She privatised quite a few industries. I'm not getting into the good/bad debate, I used to think it was awful, but having looked into it more, and understanding the theory more, I'm not so sure.
She butchered half the unions. Admittedly, Murdoch and the Wapping Dispute helped significantly here, but yeah, she did a lot of damage to Unions. In my mind. This is a good thing. I'm not going to bother arguing it. But plenty of people hate this.
She centralised the Conservative Party. What?! No?! Did I really just say that. Yes. It's part of what got her so much support, and Blair doing it with the Labour Party is what got him a lot of support. What's more, Miliband going in the other direction to the left rather than staying central, is what'll lose him the next election so long as Cameron can do a half decent job and not alienate the whole country (well technically about a third of the country...)
From 1979-90 she greatly increased spending on Law and Order, Employment, Healthcare, Social Security. Admittedly at the cost of housing, transport, trade and industry and defence. But hell, seems like a lot of good prioritisation there...
She made some great speeches, and did fantastic things for showing Women could be successful.
She let people buy their council houses.
Generally, she had good and bad parts, every PM does. But considering she got about 4 hours sleep a night, I think she could have done a lot worse of a job...
Oh, and the Queen has a lot of respect for her, but thinks she's a bit odd
Make your own opinion up. I don't care frankly, but at least make sure you look at both sides of the coin first before haring down some opinionated clap-trap view.
kd