I agree with your point about including a link and other info. Given the original review it would be very tricky to find the book in a bookstore.
The comment about grammar isn't very helpful. It's possible English isn't his first language. Lots of monks here aren't from the USA, this should be borne in mind when correcting spelling and grammar.
If you really wanted to help with the grammar problem a /msg would probably have been better.
Before coming out with comments like that it's useful to think why you're making them: to help the original author, as an example to others or to make yourself look superior (my own reasons for this post are probably a bit suspect there, I confess).