I'd argue that point and say the did a piss-poor job of making a Halo game, but a great job at making a game.
Their systems broke so much of what worked about halo in major underlying areas.
At it's core, I think it's decent. Maybe one step above Reach when looking at the starting weapon, implementation of the AAs, and giving power weapons just enough power.
What makes it shitty is instant respawn, a one shot kill starting secondary, no static weapon spawns, an unbelievably short weapon decay rate, and giving people camo and the HLS as an AA instead of keeping the Camo and OS power ups.
All other Halo fans need not apply. Certainly there's no way no other fans could have anything worthwhile to say.
Look at the dip in population bro.
Halo attempting to steal CoD's fanbase didn't work with Reach, and it fell on its face in H4.
It's in the same vein as Valve going to 1.6 and CSS players to give input on CS:GO or Nether Realm going to MK9 players to give input on Injustice.