Before we start, only buy this pack on sale.
One of only few game packs with great replayability value and not too hostile towards other expansion packs (except Vampires). This pack introduces a new "near open world" world that your sims could free roam around the entire area with only loading screen happening when changing lots, and by far the biggest one of all game packs with single world fabric. Good in-game lore that isn't linear or force you to get into. New occult sim (obviously) with good range of customisation capabilities. Fun werewolf quirks to navigate around and build up story or new challenges. Werewolf rivals with interesting backstory. Good build and debug items that aren't too tacky to use. Overall, as long as you grab it on sale, you won't gonna be too much disappointed.
There are downsides in this pack. First, there are persistent bugs that glitch out werewolf sim if you load it from gallery, sometimes its texture goes black and cannot be recovered easily. You can workaround it by adding extra paint into its fur and that pretty much fixes it. Second, certain accessory types and CAS items are not compatible with werewolves, notably, shoes and socks (they always walk bare feet). Mods cannot fix it or your werewolf sim will always wear shoes including when it takes a bath/shower. To convert shoes and socks to become compatible with werewolves, use Sims 4 Studio, but it will convert those items into Custom Contents and you use them that way. Don't forget CASUnlocks mod. Werewolf toenail may clip out socks, be aware of that. For more, there are few content creators making werewolf CCs and mods around. You can go and check them out.