Is there any way to make jack-o-lantern pumpkins worth eating?
Admittedly our carving pumpkins in the UK are smaller than yours, which may affect the texture, but this year and last I made:


three been and pumpkin chilli
pumpkin tagine
pumpkin spice cupcakes
pumpkin curry 
pumpkin, pepper and mushroom fajitas


All of these get most of their flavour from other ingredients. All were successful. 

The chilli, curry, and tagine all start by frying the diced/roughly chopped pumpkin until nicely browned with tasty ingredients (spices, onions, and plenty of garlic), before quite long simmering. The curry was last year but I think I went for quite hot, with a sauce based on tomato, coconut, and mango (I certainly did when I made it again this year).  The fajitas were cut into strips and fried, just like the other veg, though I did the pumpkin first and reserved it, to be sure it was cooked through.  Again, plenty of spices, garlic etc.

The cupcakes (for which there are plenty of recipes online) started by microwaving and pureeing, and ended up similar to carrot cake - moist and popular. I added latte buttercream.