It's always better to end positive, so let's look at what fell flat for me. Many of the items weren't necessarily awful, but they just weren't for me. There were some exceptions, but most of the products I didn't like were just better suited for someone else.
Subscription boxes can be tough, because on one hand, customization is awesome. You don't want a box of things that aren't relevant to you and with customization, you can get the items that are tailored to your style and personality. On the other hand, when you subscribe, you're going in already liking the box to some degree and customization can also mean you see other unboxings and wonder why you got a crappy draw that month. Personally, I like a mix. I like when the majority of the items are the same with possibly some adjustments for taste/preferences, yet there's also maybe one or two items that are based on your interests. That way, if they get it wrong, you're still getting similar products to other people. I hate seeing other people's boxes and wondering why mine was so sad in comparison.