I agree with Doc that how any game animal is taken, cleaned, and prepared makes a huge difference, as does what it has been eating. Since I live in Iowa and I'm getting too old an poor to wander about the country, my staples are whitetails, turkeys and small game, all of which are excellent if you do things right. If I had to survive on a diet of Iowa whitetail meat, I could happily do so for the rest of my days.
I have had elk, and it was excellent. Never tried moose, but have heard it is great as well. The only time I had black bear, it was taken and prepared by my buddy Tom Young (aka saltwatertom) from Homer, Alaska. Based on that meal, I would rank bear right up there with the best game meat out there. Even my wife, who turns up her nose at wild game, had seconds!
It is interesting to see the varied answers here. I've eaten just about everything that walks, swims, or flies here in Iowa, and the only thing I wasn't fond of was racoon. I skinned out a possum once when I was a kid, and after that slimy, stinking experience, I wouldn't touch the stuff!
Interesting thread!