I rather enjoy the Ambassador, and I can never tell you WHY. It needs a very hefty renovation and a strong face lift. The street noise is horrible. The extreme side seats have awful sightlines, but the same is true of the Winter Garden. It takes a smart director and a smart designer to work with that. It is just left to deteriorate now, sadly.
The Marquis, yes, has wonderful sightlines and wonderful sound. I love those aspects of seeing a show there. It lacks intimacy and warmth, but gives you the leg room. It just feels a bit like walking through the atrium of a cruise ship to see a show in their cheaply adored theatre. I love a classic ornate house. I love a modern, sleek house. The Marquis, as it exists, just looks as though they ran out of funding.