Yeah, the collecting feature is very interesting, although it starts to become a pain when you have like a million things in your inventory and are wanting to find a specific thing. I also like how all sims have cell phones now. It makes it exceedingly easier to get things done.
I'm not sure what to think of the Active Timeline thing. You know, where all of your sims live their lives even while you're playing one. We turned it off on ours because odd things started to happen, like for instance one of my RP-related Sims (Tiamat) had two children and his sister, Brianna, who was living with him, completely disappeared.
I do definitely like the whole Age Pausing effect where your sims never age. Thumbs up to that.