there are still many fundamental problems with the string theory and its successors m theory etc i mention just three problems which a good theory of everything toe should solve a good toe should be able to formulate its own principles and fundamental equations moreover these principles and equations should clarify and simplify our picture of the physical world and allow some testable predictions as far as i know nothing like that is still available for the string theory m theory in contrast to its rather long development and far reaching claims a good toe should allow calculations of all interaction constants and particle parameters from its fundamental principles it was actually one of the original einstein's goals to give some purely geometrical or mathematical origin to fundamental physical constants no variant of string theory is able to calculate these parameters from some first principles if the toe is formulated in some space of higher dimension etc as expected there should be also a unique and justified principle of compactification e g a principle how to project the structures from the dim world to our tangible dim world in its contemporary status super string theory is very fuzzy and umbiguous concerning the compactification in my opinion the very word theory is rather premature in connection with the super string theory and einstein himself probably would not be very happy with its present form and claims