no, it's not. what is overrated is the amount of chakra people can use during fights. especially during the war arc the whole chakra aspect has become a joke. and ok, Madara and Itachi are edos so that supposedly (*supposedly*) explains why they can just use their susanoos for the laughs of it, but seriously? nobody can deal with a susanoo generated for hours because the person who is using it has nearly endless chakra!
the idea is that susanoo is supposed to be the most perfect weapon and the one most difficult to access and use. imo after Sasuke used his against Danzo the whole matter is going downhills. i think it is best to show the signs of physical or even mental fatigue when sb is using his susanoo like it happened originally with Itachi and later with Sasuke. this way it is clear that the jutsu is practically perfect but it is not one that they would opt to use just to go to the supermarket and get some cereals.
in that sense susanoo might be an almost perfect jutsu but it is not one that can be used for long.