If there's been on criticism of Halo over the years, it's the relative sameness of the experience.
Earlier today during a discuss of the new enemy designs in Halo 4 , Scott Warner of 343 industries mentioned that some of their main inspirations for the development of the Promethean units were highly advanced, amorphous foes.
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via destructoid http://www.destructoid.com/gdc-voltron-t1000-major-inspirations-for-halo-4-enemies-249817.phtml