I'd say there are about 6 bands that I see mentioned, at least moderately frequently, around these parts (depending which threads you read, of course).
Which implies 19 bands not mentioned - at least moderately - frequently.
B2 looks like something I'd listen to.
The majority is in the realms of rock/metal and it's sub-genres. There's thrash, doom, sludge, power, industrial, battle, black, death, progressive and post-metal covered here.
There's nothing too obscure here that no one on the forum will have heard of them.