I don’t know what exactly Winger has planned, but this is a good rule of thumb which he seems to very much agree with. You’ve got the option to write and write well, and we expect it to be utilized.
Like Winger said, your capability as a writer will determine the quality of the outcome. You have a completely neutral slate, for instance - Superman, the invincible man of steel - and a good writer will take him to heights previously unattained, deep personal dilemmas, and compelling plot with a satisfactory conclusion. A bad one will give him a mullet and rapid-fire fully automatic firerarms.
So it’s not the character that is “good” - although an interesting one helps. It’s how you write it that counts. And of course, if you’re having difficulty you can always PM Winger or myself for assistance.