I just finished watching the third season of The Affair. I know many agree it's gone steadily downhill since it's stellar first season, but for me, it's still completely worth it because of Tierney. First I loved her on Newsradio, and then I was about to give up on ER when she came on as a regular and felt she rejuvenated the show.
She's also been great in a few independent movies. Despite working constantly, I'm somewhat surprised she hasn't had a bigger career.
Also, as she gets older, she uncannily resembles Patty Duke more and more, both facially and in mannerisms.
Any other fans?