Some nice, smooth, consistent quality. Better Call Saul was in my opinion pretty consistent. Single season anime is almost always consistent, like My Dress-Up Darling or Terror in Resonance.
Not dragging on longer than the series needs to seems to be a key point.
I can’t believe nobody has mentioned The Good Place yet. Solid from tip to tail with some amazing twists and not a single arc. Also they really stick the ending. If you haven’t seen it yet I’m jealous.