Why does Topaz, Hitchcock's 1969 Cold War drama, get no love?

Just saw this movie from a DVD I came across in the library, I thought it was terrific. Not a masterpiece like Vertigo or North by Northwest, but very engaging and filled with interesting scenes, and a couple mind-blowing shots, especially [spoiler](/s"Juanita de Cordoba's death"). The acting was solid too, I particularly liked the actor who played Rico Parra.

So, why doesn't anyone ever talk about this movie? It's better than some other Hitchcock movies I've seen, like The Wrong Man.

IMDb - Topaz 1969