String Theory wasn't a real theory because it didn't make predictions, and wasn't falsifiable.

Indeed, String Theory is a great deal more pseudoscientific than many believe. String theory is rather like a religion that poses as science. Pseudoscientific theories, by definition, frame themself as technical, mathematical or scientific, to give more creditability, whilst still having the two properties that make them completely non-credible - (1) they don't make any predictions (that can be tested), and (2) they are not possible to falsify.

It possible to create any number of theories with 1 and 2 above for a theory of everything. The obvious one is "God did it, but he is, along with his actions, impossible to mere mortals detect, so you can't disprove this".

The trick with pseudoscientific theories is to make sure they are sufficiently technical or mathematical, despite 1 and 2 above, so that those studying the theory get so much involved that they start to miss the forest for the trees, and whilst focussing on the trees become charmed by the ideas within the theory.

- Manlobbi