Hey at least you are able to form a group using the lfg! If this is PC, Take what you can get and try to slug your way through the dungeon or use zone chat. Hopefully, Zos will give lfg more attention in future updates.
Legacy of Kain
Vicious Carnage
¥ampire Lord of the South
I don't think this is the lfg tool. Most likely people are not selecting there correct role before queuing up for a dungeon. You can always look at your group to see if people have there role selected correctly. Some people like to leave there role as two things, sadly they usually favor one and want to be that over the other. Just something to think about the next time it happens.