My personal opinion on room correction is that you need to do what you can with the room first. Room correction isn't a substitute for proper speaker placement, proper sub placement, taming echoes in the room with carpeting, etc.I think everyone agrees with that principle although carpets are not particularly useful for echoes or bass but can help with reflections.
Also, room correction, if not done properly can actually make things worse.Again, that is true but one can also screw things up with physical acoustical treatments. For example, use of unfaced thin (1-2") absorption panels can suck up a lot of HF without affecting LF or modes. The result is a dead but boomy room.