I'm not a massive fan of the Guardian, but I wouldn't say it's loony left, there are plenty of comments in its discussion pages that indicate that many people consider it too middle ground.
Like all newspapers it has good bits and bad bits. A couple of the columnists, such as Polly Toynbee and Owen Jones can usually be guaranteed to have me shouting, and throwing things at the computer, but many of them are excellent; Andrew Rawnsley, Matthew d'Ancona, Rafael Behr, Simon Jenkins, Fintan O'Toole, Jay Rayner.....