They've actually made quite a few prolific anime in the last few years. The quality of their animation is normally quite good (barring Persona 4 which was stretched out to 25 episodes on a shoestring budget), but the quality of their adaptations can be hit and miss.
Danganronpa and Persona 4 are famously bad adaptations, and they also managed to somehow fuck up Gakkou Gurashi beyond comprehension. However somehow Humanity Has Declined managed to be a really amazing show. I'm not interested in Monster Musume or Assassination Classroom but I've heard mostly good things about them.