For me, it was Steins;Gate and Re:Zero.
Both of them have very high overall opinions, so I was expecting something comparable to Bebop or Fate/ZERO.
With Steins;Gate, it was very interesting and suspenseful when it was focused on science fiction. When it wasn't, and particularly when it was trying to be character-driven, the weakness of the character writing became very apparent. And of course, episode 18, where the stakes go from 'saving the world from becoming a brutal totalitarian society' to 'the autistic girl dies'.
With Re:Zero, it was similar. When the series was on point, it was excellent (see the first story arc and the Rem + Ram arc for examples of this). But when it wasn't, it had a number of writing issues. Overall narrative coherence, poor characterization (with the exception of Rem + Ram), lack-luster world building, occasional exposition dumps, plot holes and inconsistencies, a LOT of Chekov's guns, a laughably bad villain the second half, and a lack of establishing a point, or establishing and maintaining stakes.