Looking at Wordpress from a photographers perspective, I'd have to say that the biggest drawback for me is it's photo gallery support.

I do realize that they did an overhaul of this in the not to distant past, but it's still sorely lacking. My biggest gripe is that you have to attach media to a specific post. Writing a new post, the media doesn't show up for you to link to -- they actually seem to want you to re-upload the item.

I do realize that some third-party plugins fix this issue. But frankly, if I'm designing an entire site around photography, I don't want to be using a plugin that may or may not continue to be developed or may not be compatible with future WP versions. For me, that would be the equivalent of a blogger using a third-party plugin for their text.

I love Wordpress, don't get me wrong. But to move from the Blogging platform of choice to the CMS of choice, I feel the support of non-text items needs some more flexibility.