http://www.uesp.net/wiki/Oblivion:Artifacts
Some of the legendary weapons/ armour listed here are well designed however i feel many of them could have been designed better for being rare. For example, goldbrand just looks like a simple Katana sword when it is one of the most powerful one handers in the game.
Don’t get all indiana jones and the last crusade on me here, I know any decent weapon/ armour might not have to be diamond encrusted to be good. But for legendary artefacts i expected something more.