That's no point at all. Fans of the games will know who the characters are - no identifying required.
Anyone that's going to get butthurt by the cast not looking identical to the original property is probably not the demographic that's being targeted. If you care more about the cast looking identical than a good adaptation being made then you should just stick to the videogame... People need to have faith that the actors being cast are the best choices for what the roles call for... And it's not like these castings are dramatically different than the characters they're based on - unlike the majority of Netflix adaptations we're seeing where they're forcing diversity and gender swapping characters for no reason other than SJW points.
Watching the old Resident Evil movies, I had no idea who anyone was until they said their names, and even then, I would get confused seeing them later on.
Though, it did not help that the story was different.
Even so, saying that people should stick to the video game is ridiculous.
That is like telling someone to stick to a book or manga even though they would like to see a faithful movie or TV adaptation.
As for making the best choices for the roles, I have seen video game movies and series (and adaptations of other mediums) where the actors did not look or act like the characters, and they still did not act well enough that it would make up for that.
Regarding the casting in this adaptation, I agree, it could be worse, and really, I would say that the story is more important.
As long as the characters are not very different in looks or personality, and the story is done well, it should be a good adaptation.