Podcasts in general can be dicey in terms of quality. Sometimes you just have people making annoying, pointless inside jokes and talking about absolutely nothing. However, the two guys behind, Requiem Metal Podcast have a lot of good insights into the music and a good variety of bands and albums featured. They've covered Swedish DM, Morbid Angel, Immortal, Blind Guardian and Keelhaul so far. It's worth your time. So, listen to 'em.