Recently, metamaterials attract much attention due to a number of possible applications including those for microwave range, perfect lenses and electromagnetic cloaking. Conventionally, a metamaterial is considered to consist of metal wires and metal split rings assembled in a periodic cell structure. However, such design suffers from too small dimensions and is not suitable for cases when the objects made of metamaterial aim for largescale applications. In this review, we will show a particular type of metamaterials, named as metacomposites, ie, fiber reinforced composite material with the metamaterial characteristics; particularly magnetic microwire array enabled composites that can be employed for a range of engineering applications from structural health monitoring of composite components to frequency selective response in radar radome as a typical example. In such metacomposites, the negative permeability is due to the ferromagnetic resonance and the negative permittivity is realized from the plasmonic response which is dominated by the geometrical parameters of the inclusions, such as size and topology. They are advantageous in simplified design, isotropic inplane performance, and possible tunability of performance by stress, magnetic field and current. For a feasible metacomposite fabricated from microwire arrays, one could approach optimized design or modulation via intrinsic features of the wire inclusions in terms of composition, length, diameter, postfabrication treatments, hybridization to achieve the finest tuning capability and thus, prospective applications. In addition to such metacomposite design philosophy of key topic to this review, manufacturing automation and the resultant structural performance are also carefully addressed in order to obtain a truly applicable multifunctional composite.