After mulling it over since finishing it I'd give it a 6.5-7/10.
I stand by earlier statements on acting. The major characters heavily involved in the show from start to finish did well. Most of the secondary characters did not, however. I'm not sure if this was due to the writing or the acting ability. It felt more like the latter of the two. Again, I wasn't too concerned with the look of the characters. But if someone can't act then... they can't act. This was on full display with numerous secondary characters.
Both CGI and costume design was sub-par. In fairness, I can't think of many shows without bloated budgets where outer-worldly creatures looked good. This is a real problem for a show with a "monster hunter" as a central figure. Costume design, on the other hand, isn't very excusable. Perhaps this boils down to taste. I cannot help but think it was more lack of effort or quality to blame here.
Overall, the story and narrative left a lot to be desired. The biggest offender here was trying to cram too much stuff into 8 episodes worth of show. It's not the first show with this problem. It won't be the last. I understand trying to explore different areas, timelines, characters, etc. but it did end up feeling rushed. The execution would have been better if they had focused more on various areas and left others for later seasons.
A good example of this would be the shifts in timelines. They were not terribly difficult to follow but without knowing about the characters beforehand it could easily have caught people off guard. More importantly, it felt like an inefficient use of time. Early on these time shifts were setup and continued through the show. Later they even devoted time to come around full circle and nail the point home. Execution was poor here. They could have done a better job of making those shifts obvious. Say, slapping year dates up or something. This could have freed up more time to explore other areas, instead of dedicating a chunk of time to clearing it up later in the show.
Getting back to the point, a lot of the independent areas had much more to offer. They could have been explored better. Making cuts to fit so many events into one package was a mistake. The overall information should have been presented with a slower pace. Cover a few areas here or there but invest heavily in them. Expand the "vision" for the show out for multiple seasons. In the end it felt like it lacked cohesion and came off as a mishmash of events thrown together, without enough built-up direction.
The smaller fight scenes were well done. Aside from a few which felt forced. The larger scale battles, not so much. Again, a common problem in TV series/movies. Apparently, large scale battles means army A bull-rushes army B to the bean counters. Very little respectable strategy or tactics involved. It ends up as a pool of carnage in a big ball instead of anything remotely believable. I expect better.
Overall I thought it was worth the watch. Provided expectations are set appropriately at the outset. It's not like Netflix is a gold-mine of TV/movie awesomeness. Going forward, the show runners need to step up their game. Otherwise I'd expect it to last another season or two tops before getting the axe.