It wouldn't be bad if they had given credit to MS or Bungie, or even 343- but the fact is taht they're a business; Halo is one of the most recognizable Sci-Fi juggernauts out there and they wanted to try and cash in on the success by having clear resemblance to the 'Chief. This wouldn't be such a big deal if they had been given permission but I'm guessing they took a Spartan costume, and slapped on a few extras, just enough to call it their own, and hoped that fans of the halo series would think that it was some deal with Bungie to promote Halo in order to sell more products.
The reason that it IS so frustrating is because this is similar (At least in my mind) to recasting and selling it to the masses of ignorant people. To prove thi, when people first saw it they thought "Halo!" whether that was followed by "Halo Ripoff!" or "Halo OMG MUST HAVE TAT PHONZERZ!!!1" doesn't matter, it's the fact that they clearly crafted this suit to resemble the Master Chief's in an attempt to cash in on someone else's success. It's not the first time, and it won't be the last, but this one is too clear to ignore and put aside...
EDIT:
And on a side note: