I completely agree with the point about Gaal. I honestly thought she was a pre-teen as the actress looks very young, so start the second episode with a sudden romance was very off-putting, as she looks so much younger than Raych. I wish they would have built up to that a bit.
I've enjoyed the show, but so far it's on the strength of Jared Harris as Hari Seldon and Lee Pace as Brother Day. The rest of the show is very forgettable and reminds me of low budget sci-fi "villain of the week" type shows.
(Note: Not a bookreader, and not at all familiar with the books)