Mrs Finucane said today that her family had been "misled and humiliated in a cruel and unnecessary fashion" when they were invited to Downing Street last year, only to be told that there would be no public inquiry, only a behind-closed-doors review of documents.
Mrs Finucane said the review had been "compiled by a lawyer with strong links to the Conservative Party who was appointed by the Conservative Government without consultation". She added:
"The report is the result of a process into which we have had no input - we have seen no documents, nor heard any witnesses."
"In short, we have had no chance to assess the evidence for ourselves at first hand. We are expected to take the word of the man appointed by the British Government."
Mr Finucane's son, Michael, told reporters that while there was new material in the report regarding the extent of the threats, "it doesn't really take you much further in terms of the culture".
Previous reports had made clear that it was the "overwhelming priority" of agencies to protect intelligence sources even if there was a "human cost", he said.
"David Cameron referred repeatedly in the House to what went wrong here," he added.But he told the press conference "nothing went wrong here".
"This is exactly what it was designed to do: to improve and focus the targeting abilities of loyalist paramilitaries over many years.
"A thorn in the side of the authorities could be removed, killed, in circumstances where the state could deny any responsibility."
There were probably "hundreds of others" killed in similar circumstances, he added.
Pat's widow, Geraldine Finucane, said the British Government had suppressed the truth and attempted to throw all blame on dead. She renewed her call for a full public inquiry.
A government-commissioned report found state agents were involved in the murder of Pat Finucane - but his widow dismissed it as a "sham".Read the full story ›
Geraldine Finucane added that the de Silva report was:
A sham... a whitewash... a confidence trick... This report is not the truth... The dirt has been swept under the carpet without any serious attempt to lift the lid on what really happened to Pat and so many others.
Responding to the report Pat Finucane's widow Geraldine said:
"We have had no chance to assess the evidence for ourselves first-hand. We are expected to take the word of the man appointed by the British Government... We have tried our best to keep an open mind until we had read and considered the final report.
"We came to London with the hope that for once we would be proved wrong. I regret to say that once again we have been proved right. Yet another British Government has engineered a suppression of the truth behind the murder of my husband."
This review does have some very shocking things in it. The Prime Minister said it would make very uncomfortable reading for many people and it does. One of the facts in it is that 85% of the intelligence held by the UDA in the mid-80s had been supplied one way or another by security forces.
But I don't think I found very much in this report that I didn't already know and I think that is going to be the big problem in the hours and days ahead.
David Cameron said he respects the Finucane family's view that the de Silva review was not the right response. But he said he disagreed with them, and said a public inquiry might not have uncovered so much information about the killing.
The Prime Minister said he hoped today's report would contribute to moving the Northern Ireland peace process forward.