Oh okay.
I don't really think the simplification of details really lended to a more cartoonish appearance, just a duller plainer one. iirc, Dawn of Sorrow's color palettes for its backgrounds were fairly muted compared to previous entries, even sporting that garish straight gray area beneath the Condemned Tower. I think Portrait of Ruin was really the only one that sported a colorful range in its background. I agree that they weren't as good at portraying the intended mood, I just don't see them as cartoon-y.