I finished watching The Witcher, season 1.
Went in largely blind, having never read the literature and only played half of the first game.
Firstly, the chronology issue. I've read a fair amount of feedback on this and the only people I've seen defending it do so on artistic grounds...which is always fair, I guess. Apparently there are some people who appreciate their TV shows being presented in completely random chronological order and with only subtle conversational cues to indicate when any episode is happening. I, however, am not one of those people.
Second, the destiny thing. I can appreciate Destiny being used as an excuse for occasional coincidences. The idea that some greater force is subtly guiding individuals where they need to go so they will have an opportunity to do something meaningful eventually is somewhat romantic in a sense. However, in this show 'Destiny' is literally puppeting people, forcing them to go places and do things and feel things with absolutely no personal motive, just an invisible force controlling them. This is just about the least satisfying plot device I can imagine.
Lastly, Witcher does not do a lot to set itself apart from every other medieval fantasy. There is some decent fan service, and the over-zealous witch society can be interesting at times, but pretty much everything else done here has been seen too many times before.
Overall I'd rate this show 'watchable', but can't be much kinder than that.