In recent times, their reputation has gotten much better thanks to KonoSuba, Rakugo Shinjuu and Sakamoto. Over the years they've produced very good-looking stuff, both art- and animation-wise, but they gained infamy for stuff like Umineko, the worst parts of Higurashi, the lesser parts of Fate 06 and Vampire Knight. They still make stuff with early-2000s tier production values and poor creative direction like Super Lovers but their string of hits in 2016, one of which is still among the most popular contemporary shows, definitely helped. In general I've found DEEN to be a pretty good studio all things considered since getting into anime in 2014, but I zeroed in on the weakest parts of their Fate adaptation, which is something I avoided with Higurashi, probably due to doing a full rewatch of Higurashi relatively soon after.