"The days of Oliver Cromwell were marvellous days of freedom, prosperity, and peace." And so quoted a puritan Baptist in 1685, puritan believers as such felt that they had much more freedom under Cromwell's government. This quote is considered very biased as Cromwell (being a puritan himself) gave puritans greater freedom.
He was said to have wanted a greater religious tolerance in the country, therefore he let Jews live in England for the first time since 1290, and let Quakers hold their own religious ceremonies.
Another quote by a well-known name in history Samuel Pepys, who was a member of the government under the king Charles II in 1667 talks about Cromwell's superb and powerful leadership, "People look back on the days of Oliver Cromwell and praise him so. What brave things he did, and oh how the neighbouring princes did fear him." The fact that Pepys was a royalist is what makes this quote so interesting, as the association between them was far from friendly. So this just goes to prove the greatness of his leadership, and the braveness