I took a look at the pictures, and here's my opinion:

All in all, not bad! Though the hair and hairline are a bit off, there is a pretty fair resemblance to Brando as Don Vito. I've seen worse - a lot worse.

But calling it an "action figure" is what puzzles me. It's really not. What it appears to be is a sculpted, painted, 6" tall "statuette". An "action figure" is usually a doll that can be posed, and this one looks to be in a permanently fixed position. It's not bad, mind you, it's just that what you see is what you get - now and forever. Sculpting the clothing is also one way of getting around the fact that the way fabric "hangs" and "folds" cannot be properly replicated in scale with a doll this size when using real cloth. On the other hand, the scale they're using appears to be what's called "dollhouse scale" where 1" = 1'. So, you can go your local dollhouse miniature shop and easily get furnishings to make a setting for the Don.

A Michael doll? A Sonny doll? Well, there would have to be negotiations with any living actor (or their agents) if their likeness is recognizable. And, that could get costly. (And Pacino wouldn't let his image be licensed for the recent Godfather Video Game - and the game certainly suffered.) With the Godfather figure, I'm sure they had to negotiate with the legal representatives for Brando's estate who control the use of his image. (And, probably also with Paramount.)

As for a Sonny figure, well, maybe it's a good thing that his trousers would probably be sculpted and non-removable! That would really be an "action" figure.

Signor V.