I was in an interesting conversation today (by avgeek standards) about "best" and "worst" airports that I've visited. It got me thinking -- how do I rate an airport? Given that people travel for significantly different reasons, I assume we all have our own rating system. And even then, it probably varies with the type of travel we are doing. So when I travel for work, my rating system is made up of factors like this:

70% - general on-time performance
20% - easy to transit
10% - food options/lounges
0% - ambiance, other factors

But when I travel for fun, internationally, on crazy itineraries, it is probably more like this:

40% - general on-time performance
25% - easy to transit
25% - food options/lounges
10% - ambiance, other factors

I'm probably giving this too cursory of an examination at the moment, but I think it's a starting point. I'm curious about how others rate airports. For the sake of this thread, let's consider leisure travel in general. If someone asks you, "What's your favorite airport?" or "Which is the worst you've been in?" how do you approach it? What factors make up your decision? Specific airports are fine to mention, but I'm really interested more in how you get to your rating of what constitutes best and worst.

So...how do you rate airports?