I could be wrong but I think that's intentional. It seems like it wouldn't fit with the overall feeling of Twin Peaks to have super slick special effects.
Yeah, I think Lynch just likes that style for certain parts, but some of the effects have been pretty slick compared to old Peaks.
Ep 1-6 spoiler
Spoiler
Coop vanishing out of a chair in I think ep 2, and the demon coming out of the black box I thought were noticeably higher standard than say, the spirit of the young kid rising up, or the flames over the slot machines in the casino, which were more classic TV style.
My favourite effect so far was evil Coop looking into his mirror in prison, saying to BOB "still with me, thats good", and as he stares his face seems to morph into BOB's smile slightly, which I thought was a really subtle, and powerful effect, rather than just having the old actors face appear.
Im enjoying the new season well enough, but the structure of it being "an 18 hour movie" means the pacing is massively off. I think Alan Sepinwall talked about how this idea shouldnt be a thing because TV is its own beast and the structure needs to be different than a film otherwise you get weirdly paced stories. For example, the roadhouse scenes with a band at the end of nearly every episode, I think they are there solely because the episode needs to end and they cant have it just cut to black at whatever scene was on previously. Its just a bit off, some ep's worse than others, but sometimes it drags so badly in places (Dougie scenes, usually) that it feels almost like Lynch is pushing it just to see how far he can stretch out things and still have people watching it.
I think someone else said, certain scenes do stick in the mind which I think is always a sign that a show is doing something right, but for the most part its struggling to be as coherent and engaging as the old seasons. He seems to have moved away from it being a sort of soft parody of daytime soap operas, but a lot of that is what I really loved about the show. The very limited use of Badalamenti score is sometimes actively jarring, like I'm expecting the music to come and it never does. The one taste of the Laura Palmer theme was wonderful, and hit me right in the feels, I just wish there was more at times.
I know its Lynch, and doing the opposite of what you expect is pretty much his entire thing, but I am struggling getting into it as much as the older stuff, but I will stick with it because I imagine at some point it will click with me as his stuff usually always does.
