I have only seen one great band at the CIA, tool , saw plenty of others that could have been great but the sound is dreadful
15000 seats would make it bigger than the Birmingham NEC , we don't need somewhere that big
Cardiff also needs a decent mid sized venue , two are being built neither in Cardiff , a 3500 capacity venue in jackscum and a 5000 capacity hall at the Celtic manor , I wish they would transplant the two to Cardiff and build a ten thousand seat arena which would be plenty big enough for the larger metal bands I like and the foo fighters of this world