Every manufacturer that has an automatic setup equalizer can make it any way they want, so, no, they are not all the same. As far as I know, Denon's version is neither exceptionally good nor exceptionally bad. Any such equalizer may help, but none can make a very bad room sound good, as, for example, an equalizer can do nothing to get rid of an echo. Generally speaking, the more 'soft' things you have in a room, the better for the acoustics. Thus, paintings on the walls, tall bookcases with books, etc., can help quite a bit. So can having a rug on the floor and a nice comfortable sofa. You may have noticed that when a room is empty, there is often an echo. And, generally, the more stuff you put in the room, the less of an echo you have, though if you simply put hard flat things, such as mirrors, on your walls, this is not likely to help.
If you want the best advice possible, you will need to tell us what you have in your room, its shape, etc. You might also want to say what kinds of "room treatments" you cannot do, as you probably can put a rug on the floor if it is a hard floor, and that helps as a "room treatment".
An automatic setup can help a lot of people, though, as many have difficulty setting the levels and delays properly for their surround systems, and getting these things right can help considerably. But that is not a fix for poor acoustics in a room.
