ObDisclaimer -- Sara's a friend and she gave me a pre-release copy to read for feedback. That said, if I hadn't liked the book I would have just not reviewed it. But I'm trying to start using this site more again with the death of Twitter, so might as well start here...
I'm not normally a romantic comedy person because the tropes of the genre -- in my limited experience -- tend to the problematic. Too much of what gets presented as romance looks to a dispassionate eye more like stalking and sexual harassment. So take this review with a pinch of salt as from someone who is an outsider to the genre.
But all that said, Eight Bright Lights is a remarkably light, funny, book that manages not to make any of the missteps I associate with the genre. The best comparison I could make is that it's like a Richard Curtis film -- it reminds me most of Love, Actually -- except that where Curtis' films tend to romanticise truly awful men acting in truly awful ways, and somehow managing as a result to get stunningly beautiful, eternally patient, women to fall in love with them on almost no acquaintance, this book has a variety of actually sympathetic viewpoint characters.
The viewpoint characters are all Jewish women, and a variety of sexualities, body types, and neurotypes, all portrayed well without the usual stereotypes. Sara is herself autistic and Jewish, and so her characterisations of these aspects of the characters' identities are both accurate and self-aware, allowing her to make the kind of jokes that members of a community can make from the inside. She is not fat, but I am and am very aware of the pitfalls thin writers fall into when writing fat characters -- she's not fallen into any of them, and has very clearly spent a lot of time reading the works of fat activists to avoid doing so.
In short, it's a romantic comedy without any of the things that have spoiled the genre for me in the past. But of course avoiding the downsides does not mean anything unless there's a positive reason to read the book too. Thankfully there is. The characters are all likeable and interesting, and more to the point the book is *funny*, and made me laugh out loud many times while reading it.
Those who've read her earlier book Drama Queen, or who follow her on social media, will already know that Sara is capable of very funny work. She does that here, but without her humour overwhelming the distinct voices of the three narrators.
The book contains some discussion of serious subjects, but it's not a deeply intellectual book -- but that's not the same as saying it's not an intelligent book. It's froth, but froth that doesn't insult the reader's intelligence. In genres I'm more familiar with, it's on the same easy-read level as Andrew Cartmel's Vinyl Detective, Ben Aaronovitch's Rivers of London, and Nev Fountain's Mervyn Stone series -- a quick, fun, romp rather than something intense and weighty. But there's a craft to doing that sort of thing well, and it's done very well here.