I was actually someone who loved the TS3 store. I originally loved the idea of the kits, and I bought a couple of the early ones that I have really enjoyed and used a lot (Courtyard and Country kitchen). However, it's a little annoying that the sole gameplay kit is yay, more cleaning, and also apparently broken/buggy, from what people have said.
It's all gone downhill from there. Way too many clothing kits, and concepts that either don't interest me at all, or that sound good but I don't love the specific objects actually created (looking at you, plant kit).
Which would all be well and good, if they were just one small part of the spectrum of "something for everyone," but in the absence of literally anything else, for several months, it's become much more glaring that there's absolutely nothing for me. (Unless you count challenges or story progression, which are also 100% not for me.)
I genuinely hate to be so negative, but this is where I am with TS4 these days. It doesn't help that it looks like they straight up lied to us about kits not replacing other content.