We shouldn't have to hold new series to a higher standard than the originals
Seriously?
If only on technical aspects (e.g., special effects, higher resolution) I'd disagree with you. But I believe in constant improvement across all aspects. Acting, story telling, etc.
ETA: Add in the fact that one of the largest entertainment conglomerates in the world is now in charge, having an unmatched capability to finance projects and attract top end talent, the disconnect between expectations and what Disney has actually delivered is massive.