The biggest irritant other than the above is that a couple of the taskbar widgets were missing. What I take away from that is that one little feature can influence us quite heavily. And it's pretty much the same story for Opera. I totally relied on the fit-to-width button and I love their spatial navigation - but have found myself using Firefox - just because I can make it more readable with a couple of easy modifications (though I still have issues with that.)
Give me a one line or paragraph summary of what Gnome 3 is, and why you'd want to use it over Gnome 2! Then try the same with Opera vs Chrome.