The simple answer is the security is beyond suitable for a paid software. Also the ACP is way too simple and hard (for me personally) to navigate and find what I am looking for. Don't get me wrong, I enjoy being a member on the very very very few vB forums that I am on, but would never want to be an admin on one.
So ACP is simple yet hard? I find it easy and you just need to get used to it, but fair enough. Each person is entitled to their opinion.
This reminds me of facebook. I feel like I am updating my status right now. I see people posting random stuff about their lives here. :D