Looking at these titles off the top of my head, I'm seeing quite a few that are not truly isometric: Diablo III, Command & Conquer III, Rome: Total War, Warcraft 1 & 2, Zombies Ate My Neighbors.
Some of those are rendered in 3D, and are therefore not eligible as isometric, and others are just "three-quarters down" overhead viewpoints.
For a better idea of what actually qualifies as isometric, see here.
Isometric Viewpoint
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