I've been using RSSdose for a few minutes this morning and unfortunately it is not sturdy enough to do what I need. I started out by importing my subscriptions OPML file and letting RSSdose gather posts. This worked fine for the first few hundred feeds, but then I refreshed the screen and saw this:
RSSdose wasn't able to support the large number of feeds I follow. I've been waiting an hour now and it's still frozen, so I plan to simply give up and look elsewhere.
But in the few minutes that I used RSSdose, I did note a few issues.
For example, I don't care for the pinkish-gray background. It's not unreadable but I would much prefer something closer to white. I also noted that there's no search option nor any meta-sorting and filtering options. if you want to only see unread posts you'll need to change the settings one feed at a time.
I unfortunately cannot show you what an article would look like; I didn't think to get a screenshot before it froze. But I did find a tiny screenshot on the homepage for RSSdose, and it is embedded at right. Note that this service does appear to support folders.
All in all, I don't see anything to recommend this service over the competition, but that really comes down to personal preference. If you like the pink background then this should be an adequate news reader.