There are three main rules when it comes to making good cooked carrots. In no particular order they are:
1) Do not overcook the carrots.
2) Do not overcook the carrots.
3) Do, not, overcook, the carrots! (Said in your best Captain Kirk imitation)
Wash, cut carrots in your preferred style, place in water in a pot, bring to a boil, lower heat to simmer. In five minutes (or less if you've cut them very small), remove one and taste. Repeat every 2 minutes or so until desired taste and texture is obtained. It bares repeating, for best results - do not overcook the carrots (I'm sensing a trend here). Drain. Add equal amounts butter or margarine and brown sugar (about 2 tablespoons each for 3-4 cups of carrots). Stir. Salt and pepper to taste. Serve. And please try to remember, do not overcook the carrots.