For me, when it comes to reading a piece, the best effect is when I’m intrigued and stimulated by the writing. From beginning to end, the piece falls into place nicely and sits well. The reader, that’s me, senses the piece is drawing one in, rather than away. How would one do that, as a writer? I think one must make it always interesting, with facts, color and imagination, descriptive prose, and good ideas, producing “the effect” on the reader.