Special relativity still holds where it is applicable, and general relativity has yet to be refuted, and has been verified in interesting ways (gravitational lensing of Mercury with regards to the precession of it's perihelion for example). Einstein's other ideas about phenomenon such as the photoelectric effect and Brownian motion have been long since verified, so I would say, especially in comparison to some of his contemporaries, his theories oh withstood the test of time very well.
