Neither are atrocities. Both have a purpose, and that purpose is melee damage. On Summoner, this means more damage after it is impossible to get more damage out of your avatars in any way. Does it drastically change anything? Not really. But it's still an upgrade and it's still useful if you're into that type of thing.
The relic weapons were created to be the best WEAPON weapons in their classes. Not the best stat sticks in their classes. And ignoring pre-upgrade comparisons to delve weapons, you can't really say that Claustrum doesn't do that job.
Just because it doesn't do what you personally want it to do, doesn't make it an "atrocity." It's like calling a coffee maker an atrocity because it doesn't make toast. Maybe you want toast, not coffee, but that doesn't mean the coffee maker isn't good at making coffee.
I know that posts bashing the mage relics will get 893457 likes and those that know that some of them do have their uses won't get any, but I'm posting it anyway.
Now the Mythic mage weapons were made to be more like stat sticks but they failed in that regard because there were already existing stat sticks that were far superior. The Emp and Relic weapons on the other hand aren't trying to be stat sticks- of course they won't look good if you judge them as if they were.
(And yes, I know the current Audolin weapons are currently superior in this regard, but that will very likely change when the RME upgrades are implemented)