I find at times like this, it's good to offer an alternative perspective as well, as public criticism of a product can be easy to take personally.
For what it's worth, I found the product incredibly intuitive and very easy to setup. (This was 2 years ago, and the product was young, so I don't know what new features, read complexity, have been introduced to the product.)
Yeah, I've had no trouble dipping my toes in, trying things out, and then expanding beyond the simpler stuff to more advanced things. In a couple months my company has achieved some awesome results already, and we've been able to put together little fun promos like an Easter Egg Hunt that would have been much more complicated to do without (outsourced) back end support if we didn't have a tool like Optimizely to let us play around with our website.
For what it's worth, I found the product incredibly intuitive and very easy to setup. (This was 2 years ago, and the product was young, so I don't know what new features, read complexity, have been introduced to the product.)