I have heard it said that "Google loves WordPress" and therefore WordPress SEO is easier than for static sites. I do not believe this is true as we have seen many times that Google's objective is to display the most relevant content to their users. It would simply not make any sense to think that they would favour one site over another simply because of the platform it is on.

Having said that WordPress SEO (and blogs in general) does have some advantages over static sites, so in that sense WordPress SEO is easier:

Blogging in General

Most WordPress websites are blogs or are sites including a blog (although there does not have to be a blog) and the whole point of blogging is to post regularly. Search engines do favour sites that are regularly updated so WordPress SEO has an advantage here.

Ease of Updating (No technical knowledge)

Static sites can be difficult to update and maintain but with WordPress it is very easy and no technical knowledge is required. This means that a WordPress site is more likely to be regularly updated, which is another WordPress SEO advantage.

RSS

An important WordPress benefit is that all WordPress sites automatically have an RSS feed. This allows updates to be sent anyone who wants them via an RSS reader or directly to their email. The feed can also be submitted to directories to get links and traffic.

Ping

WordPress will automatically Ping updates so they tend to get indexed quicker than on static sites.

Interactivity

Comments can be left on WordPress content and this creates interactivity and returning visitors. Developing a good relationship with such people can be powerful for SEO proposes.

Plugins

There are a vast range of plugins that can be installed in WordPress and many are SEO related. Most of these help to configure WordPress SEO to maximum effect and possibly the best known is "All In One SEO Pack". This, amongst other things, gives control over how the site is displayed on the search engines, controls the duplicate content inherent in the WordPress structure and allows you to control the title, meta description and meta keywords for each page/post.

Again all of this can be setup easily and quickly (and changed when necessary) without any technical knowledge.

You can even get a WordPress SEO plugin that checks how well you have optimised your pages and posts then tells you want needs to be improved.