It’s an enthusiast device. As a gamedev myself, it’s super fun to make little games for, and then you can easily show your friends/family. The limitations and unique input (the crank) lead to some awesome and interesting games.
I don’t really view it as a serious gaming device. It’s great for 5-20 minute sessions but it is basically a toy. I think if you’re interested in experimental indie games, it’s a great little device that’s absolutely worth it. It shouldn’t be directly compared to a “normal” game console because, frankly, it isn’t.