What is considered a useless degree?

David Beckham studies- come on, how can anyone argue that's not a useless degree

Viking studies? what can you do with that?

Isn't that pretty much History though? But focusing on a specific period rather than a wide range.

it's a 3 year degree too! is there 3 years worth of work in studying vikings?

I checked google and this is what came up

Danish, Norwegian or Swedish language learning
Old Norse
Contemporary Scandinavia
Linguistics and the Scandinavian languages
Scandinavian history
Sources for medieval archaeology
Runology
Early medieval archaeology of Britain
Medieval Scandinavian mythology and religion
The Viking legacy in the British Isles
The early Christian and Viking period in Iceland
Early historic and Viking period in Scotland
Year studying in Scandinavia
Research methods
Learning history
The birth of Europe 500-1200
Introduction and approaches to archaeology
Medieval studies
The Dark Age and medieval Europe
Environmental archaeology
The Viking Age
English place names
Edda and saga: an introduction to Icelandic literature
English studies
Research methods

Some of these examples make subjects like Media Studies, Photography, etc, seem like an Engineering degree in comparison:

Harry Potter and the Age of Illusion – Durham University

How to Train the Jedi Way – Queen’s University, Belfast

Lady Gaga and the Sociology of Fame – University of South Carolina

Politicizing Beyonce – Rutger’s University, New Jersey

Equestrian Psychology – Glyndwr University

Viking studies? what can you do with that?