I just checked out the service and I don't understand what's with the hate?

It's a Pinterest/Delicious/LastPass mashup, and while I would not trust them with my passwords (they really should rephrase that explanation, or give a real overview of their security measures), there are plenty of people who will (my parents still store their passwords in simple text files :-)).

If they add RSS-reader functionality, I can actually see myself using the site as a home page!

I believe it's got potential - they'll have to work hard on the marketing and keeping even or ahead of the competition, though...