Our themes are developed to work exclusively with our features, and designed to include all manner of additional hooks and functionality built in that allow us to deliver highly personalized end results for our clients.
WordPress is a better all around site that makes it easier and faster to publish your content and regularly update your site (which may also explain why it's believed to be used by close to 25% of all websites currently online (Source: W3Techs.com).
This is great for two reasons. Number one it’s a positive social indicator. You want to give Google as many reasons to trust your website and the content from your website as possible. This is one very good reason. Number two, it’s going to increase clicks.
Everything that you do with your website, whether it be adding a piece of content or adding a new page, the first thing you need to do is focus on "how do I provide value to the person I'm intending to read this."
Now, if you want the site to look good... you're still going to need a designer, but because you're asking the designer to customize an existing theme to make it work for you, what you're essentially asking for is for a semi-custom design.