Einstein did consider that quantum theory had a considerable amount of truth in it.
What he did not accept was that it was a final theory but that there would be something more basic that explained the more unsatisfactory elements.
What he disliked most was the claim it made that we only can talk about what we observe or measure and that it is meaningless to discuss things that are not observed; he did not like the implication that we could not talk about whether the moon is really there or not if no observations of it are made, and the strange situation exemplified by Schrodinger's cat.
This was because he was a realist about the world and thought that the world was really there at all times and this was partly also why he wanted to say that in principle a particle always had a definite location and speed even if we couldn't know both, whilst for quantum theorists this was something fundamental about the world that we can't say that but rather there is merely a fuzzy superposition until a measurement is made.
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