Well, obviously you don't measure by edition, but by the game itself. D&D is still supported, D20 Modern is not.Well, then all games "fail", eventually. All editions of D&D other than 4e have now "failed", by that measure.
Personally, I think having a miniature-based game without miniatures is a rather large flaw. There were other weird elements to the presentation too, like the core book not presenting a particular genre. Maybe they should have tried a setting-based game first, and then rolled out D20 Modern later. HERO System, for instance, was preceded by the publication of Champions (and the other less well-known games).
The covers of the D20M books were rather blah for the production values that went into them. A metal-grey cover with a self-consciously ethnically/gender-diverse trio of folks posing in a polyhedron shape. Who thought this was evocative? They could've done something a lot more eye-catching.
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