When I first got the game, I really enjoyed CAS, multi-tasking, the graphics, faster loading times and etc but missed the charm and details of Sims 2 and the open world/color options of Sims 3 (but not the lag).
With all of the free updates and DLC so far I say it's very worth it! In my opinion, Seasons, Cats & Dogs, and Get Together (club system) really livened up the game a lot. City Living added cultural diversity and a new way to play with apartments/rent. Get to Work has its charms, though it's not my favorite. The retail system is interesting but flawed. I haven't played much of Get Famous yet but it seems to be another one that livens the game a bit, especially if you want to explore the acting career.
As far as gamepacks, they all have been worth it in my opinion--particularly Vampires, Parenthood (adds a lot to the game) and Jungle Adventure (with the new self employed career you can literally be a treasure hunter/archaeologist like Lara Croft haha). Stuff packs are a bit more hit and miss, but they have gotten better with each rendition for the most part. My favorites of those would be Laundry Day (the items/CAS), Movie Hangout, Backyard Stuff, and Kids/Toddler packs if you like families.
The new first person mode--if you can handle the view without getting sick--is a refreshing take on the world and allows you to see your sims and worlds in a new perspective. It's especially great if you've built/decorated your house from scratch!
I hope that this helps. There are a lot of items/ideas from The Sims 3 that I miss, but I think they'll be implemented in The Sims 4. I do like that this time around The Sims 4 is alternating between "classics" like Pets, Seasons etc with a fun twist and introducing completely new concepts. It's great and all to one day get University and occult sims back, but having new ideas is unpredictable and exciting!
Happy Simming! :mrgreen: :heart: