Why oh WHY does this figure suck so much compared to the SPARTANS!?!?

I bought two ODSTS and as far as I can tell, their armor falls off more easily than the SPARTAN'S armor, one of their wrists can't move and they have zero neck articulation...seriously, what the shit?

Also, why did McFarlane make the guns so small???? They look like they belong to a 3 ¾’’ scale toyline like GI Joe or something...