Feedly is not a web app. It's a browser extension.
I wanted to use Newsblur before Reader was discontinued, but it never made sense to me -- way too complicated. Also, no mobile web. I like their business model, though.
The Old Reader works well enough for me to suggest it to my girlfriend and mom, but I don't like all the space the navigation bars take up and I don't need/want the social/sharing features. Also not open source. I do like the responsive/mobile layout.
FeedHQ is an interesting change from the Reader-clones, and I like the mobile version. Still hasn't added an oldest-first option though, and sometimes miss being able skim through articles Reader-like instead of viewing either titles or single articles. Other plusses: open source, python, no social (yet?).
Commafeed was a little rough when I first saw it, but overall I like it the best so far. The OpenShift instructions look very doable (just have to try them). Needs: mobile view, optimization. (Both on the Github issues list already.)