Like others of said being a good hunter includes obeying the laws and respect for the game, land and other hunters. A good hunter doesn't waste meat and hunts for the right reasons.

But......there is more to it to me than just those things if someone is to be considered a good hunter. I think a good hunter can find the game he/she is seeking very well and make one shot kills when a shot is taken. So in addition to the above things I would also say:

A good hunter must be very knowlegeable about the game he/she hunts. If the animal calls be proficient with those calls and know what each sound means and when to use it. The better you are with the calls the better the hunter you are going to be. You need to know where to find the animal. What does it eat? Will it be in heavy timber or quaking aspen? What time of day is it most active? What are it's rutting habits? Where will it go when pressured? The more knowledge you have the more successful you'll be.

I think a good hunter is very accurate with the tool he/she is using to take an animal. You should practice all year long with your bow, rifle or whatever it is you are using.

A good hunter knows when to take the shot and when not to. You know the biology of the animal so you know where to aim when broadside, quartering away or to you.

A good hunter scouts. Gets to know the land and the animals that live there.

I think all these factors contribute to being a good hunter. If you can master all of these things (which I have not) then I think you'll have hanging on the wall what ever you feel like or as much meat in freezer as you can handle and you'll be well respected in the process.