In my opinion, no. It is nice, but it doesn’t have enough features, or enough uptime.
I don’t see why I should have to vote for one of the feature requests listed on the page – many of them are needed. Flickr is owned by Yahoo! now, but I’m not seeing much innovation… a lot more could be done to improve and add features without ruining the user experience. Rather like the problem with Google’s ownership of Blogger – not enough evidence of development and improvement.