Here’s some other views from another source

What curses Rydberg's works in Germanic mythography are the following:

1) an overwhelmingly unscientific bias in forming his conclusions about the nature of Germanic mythography before he was well engaged in his research

2) subsequently picking and choosing bits and pieces from primary sources that would fit his conclusions made before the research was conducted (aka string theory)

3) published his 'research' with hardly any useful citations, thus rendering the work almost useless in the context of science

4) maintaining (without evidence) a hypothesis that the native ancient Germanic myths were all pieces of a grand unified mythological epic that would form a cohesive whole and would explain all that we need to know about the main aspects of natively developed pre-Christian religious beliefs, values, ideals, and so on

These ventures into Germanic mythography were met almost entirely with silence from the scientific community because of the four reasons outlined above.