I judge a game mainly by how much it pulls me in. The more it makes me want to play it, the more I like it. So, immersion. The thing is that I don't care HOW the game immerses me, as long as it does so.
I can forgive Wind Waker's long sailing times, low difficulty and the fact that it's just one giant macguffinfest thanks to the wonderful art style, nice intuitive gameplay and amazing music.
Metroid Prime has apalling controls from the standard FPS point of view, but the way the game world looks and sounds pulls you in, and the controls WORK for it. In fact the only real gripe I have with the controls is the difficulty in switching targets and that there's no way to pull a fast 180, but it doesn't MATTER so much.
I'm more than willing to overlook any flaws a game might have if it pulls me in hard enough. I have no universal standard for rating a game because universal standards just don't work. While I don't care much about graphics, I'm not about to shun good graphics if they work. Even unintuitive controls I can handle, as long as it keeps me sucked in. I'll do action, adventure, long grindfests, just about anything other than racing games (and even then I make an exception for F-Zero, despite sucking to death at it) if it entertains me