^ Because these are toys for small children. Sure, the soldiers are simplistic, but they're just part of the playset - packaged with monsters, vehicles, and weapons - and the 18 inch Kong is the centerpiece of the intended playset, with all the characters roughly to scale.
This toyline may not be for me, but five year old me would be all over it. I think kids loved Godzilla in the '14 film, and were underserved by the toys. It seems they're trying to correct that here.
... I wonder if Pacific Rim will also get a kid friendly toyline? It really deserves one.