I can put a positive spin on this or a negative spin. If you count continuations and sequels then the Spring season was actually pretty strong. On the other hand if I look only at new shows this seems to have been an unusually weak season. This could be a bad sign for the future, but my philosophy is to hope for the best.
Little Witch Academia
(Started Winter 2017.) Little Witch Academia (Netflix) is basically a children’s story, clearly influenced by the Harry Potter series, but not nearly as dark or self-important. If you are willing to accept it on those terms it’s pretty darn good. It has a fine story (though fairly predictable) and the animation is outstanding.