Semantics markup for home sliders
For me the main semantic question is whether you should have a section containing articles or an article containing sections. Or perhaps even an article containing other sub-articles.

From the HTML spec:


  The article element represents a complete, or self-contained, composition in a document, page, application, or site and that is, in principle, independently distributable or reusable, e.g. in syndication. This could be a forum post, a magazine or newspaper article, a blog entry, a user-submitted comment, an interactive widget or gadget, or any other independent item of content.


It really comes down to the content of your articles and sections.


If each slide could be viewed as an independent thing, then marking them with article seems fine.
If however, you'd expect the slides to be viewed in sequence as in slide show, I'd say the slides should be sections instead.