Has anyone been to tkts this week? Interested in serious drama. Thanks.

At their website, you can find a listing of what was available the previous week--it's sorted by Broadway and Off-Broadway. www.tdf.org/tkts/

Doubt will definitely be available at TKTS.
Three other possibilities--Awake and Sing, Faith Healer and The Shining City--might be available.
However, in the case of the last three, discount tickets are available through www.broadwaybox.com at prices a little higher than TKTS...but it means that you can avoid waiting in line. Just run off a copy of the offer and bring it to the box office. (You can also do this for Doubt.)
All four are recommended.

All four plays that HowardR mentioned will be closed by the end of July, so now is the time to jump on tickets if you're interested.

You can find out what's likely to be at Tkts by going to www.playbill.com and clicking on the link for Broadway Grosses. Look at what shows aren't filling their houses.

Since the original poster is asking the current situation, I would assume that it was this week!

True, HowardR- just wanted to make sure the OP doesn't save any of those plays "for the next trip."