Even if some of NDs stuff was just inspired by Halo and CoD stuff without any direct interaction between companies it would be appropriate to acknowledge those developers. However I don't imagine Bungie or Infinity Ward would want to be acknowledged unless they did have at least some slight input.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix







