Piwik? I don't want a Piwik-compatible option. I'm not even complaining about Google Analytics, I'm just saying it doesn't sound well to just tell people to open Google Analytics.
I would complain the same way if a website promised a guide to calculate interest rates and started the article with "Open Excel...".
Adding a "For this to work you'll need Google Analytics installed in your site" notice would solve everything.
Why is that necessary? The "open Google Analytics" part makes it clear enough. It's not as if they're an interpreter that is going to crash when they see something they can't logically do ;)
