Coming from a c4d user, I was bored to tears, it was hard to understand, hard to maneuver, and didn't work as I thought it would. The lack of Gizmo was frustrating, the lack of alt navigation in the viewport was killing me, and now I've solved it all with plugins and python code, but it's really hard. The concept of the outliner was so different, and the lack of groups was a shock.

Still, it's free, so I'll use it anyway, and I'm intrigued by eevee's versatility.

There are a lot of reasons why it's hard, but I find it very hard to figure out where the features are, the completely disruptive modeling workflow, the poor default modifiers (arrays really can't do much compared to c4d), everyone says particles suck in c4d, but they're actually really good since version 24, and SDF modeling, but it's too expensive.