I use a Wordpress plugin to generate sitemaps and submit them to google -- no problems here.
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The sitemap provides a method for search engines to instantly crawl your site particularly if its new pages were added, and also, the priorities assists gives search engine thoughts on how they would give significance to each pages of the site.
If you're having problems with getting Google to accept your sitemaps then it likely has everything to do with the sitemap generator and absolutely nothing to do with the fact your site is based on WordPress.
When you submit your sitemap.xml, if there is a problem then Google will tell you exactly what the problem is. One VERY common problem is that people will submit sitemaps with URLs in it that get redirected when Google requests it.
If you have URLA on your site that redirects to URLB, you have to submit URLB (the target of the redirect). Submitting URLA will result in them rejecting your sitemap.
If you host your site on your server, you can use uploading the file that Google provides to you on your Google webmaster tools control panel to your server and if you site is hosted on a third host as wordpress.com, You can use provided meta tag to verify your website with no problem.
The sitemap is just a list of your pages in a solo page layout. When a caller goes to your site they can right to use the sitemap to discover any pages that they are concerned in viewing. typically the sitemap is to benefit the people who stay your site and give them a quick and easy way to navigate your site.