I really enjoyed this one, am finding the second one harder going but enjoying the Elizabethan period detail - Deborah Harkness really does her research. IMO she is very good on background detail and really not that good at people and dialogue, she does also take time to get going. I'd hang in there, it gets better.
Well I'm giving it another 'proper' go and am hanging in there...
I like the idea of the story (particularly the next book) so I do want to enjoy it, just struggling with the prose. 'He watched as she opened her bathroom window. That will save me having to break in, he thought' was a particular low point IMO
Probably quit if you've made it that far and don't like it. It carries on pretty much in the same style. It's not particularly well written, however I personally quite enjoyed it and bought the sequel. My days of concentrating on worthy intelligent fiction are over probably until DCs are a bit less exhausting!