I’ve only seen her in Luther and The Affair (I’m halfway through). Holy smoke! So much intelligence, just so … outstanding; she, literally, stands out.
I looked at her Wikipedia entry and see she’s back on stage atm with not a lot of stuff in the pipeline - she’s surely destined for the very top roles whatever the format.
Google found this; a very odd thing, really: an Editorial in The Guardian praising her to the rafters - after her 4th professional stage job:
I’m going to have to go back and see her 2006 Jane Eyre …
I agree that she’s good. I didn’t like the character in Luther, nor do I like the current series she’s in (only made it through two episodes), so that sort of colors my view.