I don't really see the negative in that. I actually want my feed reader to fetch the full website/page/blog instead of showing the feed content. And I like integration of content like video or text files or whatever to work properly... eg I loved when I clicked a link to a source code file in a blog and it opened in a tab, fully syntax-highlighted ;-)
Or clicking a video link and having it open in a tab & play with the embedded player-of-choice. Etc.
Keeps my desktop from having a mess of windows open... Focus, focus ;-)