According to Hanson, if you're reading a book and find grammar issues, the only solution (unless you're a bully) is to email the author and help her edit the book. If you choose not to do so and review the book negatively, you're full of malice and must be silenced.
So next time a book sucks, listen to J.E. Hanson and become a beta reader!!! Let's fix crappy books, one butthurt baby at a time.
Most of all, remember what JBG says...