Sure, you can find better GC support in languages that are built around GC, and you can find better functional support in languages that are built around FP, better OOP support in everything-is-an-object languages, but what D does is enable one to mix & match GC, FP, Metaprogramming, etc., in the same program.

Most D programs I write use a mix of these technologies.

As for metaprogramming, D is very very good at it.