Here you got a recipe with some of that problematic feeds. As you'll surely see, only some links and other stuff is retrieved, but none of the relevant content.
class AdvancedUserRecipe1264625674(BasicNewsRecipe):
title = u'Feedburner-Bloglines'
oldest_article = 7
max_articles_per_feed = 100
feeds = [(u'Kindle World', u'http://feeds2.feedburner.com/AKindleWorld'), (u'dilbert RSS', u'http://feeds.feedburner.com/DilbertDailyStrip'), (u'Firefox Extensions', u'http://feeds.feedburner.com/firefoxtensions'), (u'www.pointblankmag.com', u'http://www.pointblankmag.com/rss.xml')]
In spanish you can test this bloglines site:
http://tinta-e.blogspot.com/
I get just the comments and the links, but not the content.