Contents wise, it is informative and full of analysis and columns by some of my favorite writers (Cory Doctorow, Ben Goldacre). It is also short on the bullshit department: on the day in which the mostly Murdoch dominated rest of the crowd chose to put a photo of David Cameron's baby daughter on their front page, to commemorate her going back to hospital on her first birthday, The Guardian was the only one to relegate coverage of this nonsense to a small photo on page 13. That's the way you do it.
My mate Pat Condell may describe The Guardian as a left wing, middle class wankers' festival; I would argue that description captures me to a T, explaining exactly why I like The Guardian as much as I do. Even if I would prefer to call it "depth" instead.