"Far more hits than misses."
I've been subscribing to TTBOOK for months now, and I have to say that I (generally) enjoy the show.
There are some segments that are as boring as bat-droppings ... but I'd say I find about 80% of the segments worth listening to.
I use the program as a 'diversion' as I take my daily walk - and sometimes I have to keep walking until an item finishes - the perambulatory equivalent of what NPR calls a 'driveway moment', I guess.
It's certainly more consistent than This American Life, and is timeless when compared to ATC or Morning Edition - which date badly if you don't listen with a day or so of broadcast.
Overall, I'd put it at around 4 stars.