Dan Carlin has a great radio voice, and is an entertaining presenter. Hardcore history is really only okay on the history front though. Plus they are relatively shallow with how short they are.
I think Carlin himself would be the first to admit that, even does so in the intro to many episodes. I think he already suffers from the length of some of his series.
I think this is a fair take but it works great as a gateway drug!
I am curious what are your recommendations though. Always eager for expanding my horizon.