I'm not really sure how it's "doing" because I haven't checked & I'm not sure it's fair to judge until the full thing is out. What I do know is that a lot of people I know (including those who normally don't play RE games) are either playing it or expressed an interest in it.
On a personal level, I'm thoroughly enjoying the game. I like that it has a different feel to most of the other RE games but is also somewhat familiar.
The episodic format works fine for me. The way that I paced my replay of the entire series over the past 5-6 months or so was to play in small segments each day. It means I can make the episodes last a couple days & still have my "Resident Evil Slot" in my daily routine, without feeling like I need to rush through the story so it's not spoiled.
It's a nice experience, I'm very happy with it.