I just finished this afternoon and while I would like to let it sit, my initial thoughts er on the side of satisfied, though not without some reservations. Ultimately I think I'll have to rewatch the whole series; despite having started only a few years ago, not every detail is fresh in my mind. That said, it's part of why I enjoyed it. So many stories are clean cut, even something like Lost didn't necessitate a rewatch because it was fairly straightforward. This, depending on your interpretation, leads to much more nuance.
I see theories about multiple timelines and universes, etc. Not going to say anyone is wrong, but if this is in fact the end, my thinking is that this is indicative of most of the series having been a dream, and we are only in the waking world when Richard comes to in the motel.
Most use this trope to justify nonsense and to say none of anything actually mattered, but here I feel that it fits very well thematically and is an original way of exploring a character. Perhaps it was not always in the cards to have it play out this way, but maybe it is better than what was originally conceived.
All the reports to Diane, her colors matching the Black Lodge, the dreams taking place there and eventually actually going there, meeting an evil personification of yourself (can't forget "I did not kill anybody"), being trapped for so long...among so many other things. It's a lot more interesting to peel these things back to get to a deeper truth, of the man known as Richard, perhaps who was once an agent on a failed case, who maybe had a failed relationship, stuck in the past.
FWWM was centered around Laura for sure, and who knows if there really was a girl who was murdered - whatever the case, I feel this story of a little girl down the lane might be projections from Richard, romanticized thoughts of a good person in the wrong place at the wrong time, opressed by the ever present supernatural Jowday, when really this was a paranoid person who made her own bad life decisions and was stuck at a dead end job.
And to that end, it could be a commentary on society as a whole getting stuck on these tales when life can be far more dull. Ultimately life is what you make of it.
As far as actual artistic merit goes, that's a bit difficult to say...like others I got a bit tired of Dougie, and it does feel like there was a lot of padding in general, but at the same time it was a breath of fresh air to get something not so formulaic in the medium for once; the highs and lows were made all the better for not knowing when or where they would come.
That all said, I think I'll take some time to read everyone else's conclusions on both sides.