I'd say level this toon a bit more, maybe up to 30 or so, and see how you like the experience. If you find questing just a means to an end, maybe the guide would be a good buy. Me, I generally like questing and go to an area I'm interested in, even if it's not the most level-appropriate for me or the best way to maximize my time, so those guides aren't of much interest to me for now.
Overall, I'm very disappointed that half of them are barely even worth crafting, and there's little equality between them either, but still pleasantly surprised with how Alch and Tailoring turned out. Skinning, Herb and Mining not having anything even though they all have small crafting abilities is a big disappointment too; those three really should get rolled into other professions/become secondary professions with this kind of neglect.
In addition to questing and running dungeons in the Broken Isles, players should also remember to visit their class hall, which is like the garrisons from Draenor, but themed around your character’s class.The quest lines in your hall provide valuable experience and open up important features, like artifact weapon upgrades, that will drastically up your character’s power.