>>5367639Both gladiators and samurai sets do exist. There are quite a few of each in 1/72 scale and 1/32 scale(classic toy soldier size).
Also, there are plenty of detailed molds out there that you can buy. You just will not find them at your local toys r us or dollar store. You just have to go online and look for them.
This post:
>>5364311 lists a couple of sites to look for items.