As mentioned they tend to find a sound for a group and then stick to it. Luckily the sounds they found for Sistar, Twice, Apink and Chungha all worked but for their own group they seem pretty far off still.
After Dumhdurum came out last year they solidified themselves as the most consistent hitmakers for me over the last few years but since then they've only produced for this group and it hasn't been anywhere near as good.