It's just perfect. You get a nice blend of sunny and cool. Everything smells wonderful. The world is an explosion of colors. You can wear your nice sweaters and not freeze to death. It's far less muddy than spring.
Both Thanksgiving and Halloween (favourite holiday, ever) fall within autumn's purview -- at least, if you're in Canada. If you're in the US your
This may be because I'm Canadian, and our Thanksgiving doesn't seem to have the same themes and motifs surrounding it as the US one does. Or it may be because for me personally, it never had elements of "And the Indians gave the Pilgrims food, and then the Pilgrims killed them all, and it was GOOD!" until I moved to the States, at which point I was already a teenager, pretty much -- even then, it was more about food and family.
Or it may be because I love turkey, mashed potatoes, stuffing, and pumpkin pie. That's also very likely. Most of my emotions are connected to food in some way.
In general, fall is the best season EVER. Good weather, good smells, good colors, good clothes, good holidays, and good food.
Oh, and the pumpkin spice latte is available at Starbucks. And the pumpkin scone, if you arrive early enough.