I mean seriously, man in Fallout 3 all the super mutants were incredibly stupid.. In fallout 1 they were at least superior in terms of intellect ...
Most supermutants get stupid by the FEV and it's known that only a few are left capable of a high intelligence, so no surprise really. And in FO1 it was only the master and his lieutenant who were the only exceptions. And finally in FO1 the theme was mainly about the master and the supermutants.
I wished the supermutants would get a theme again (questlines, story around them, etc.), then we would see some creepy intelligent ones again. But we have so many major factions that need development (BoS, NCR, Enclave, Supermutants, Ghouls, Commonwealth) I don't know when the supermutants will get their time again.
I would like to see a better supermutant development in New Vegas with a hint to an upcoming supermutant threat with new aspects or a revival of the unity project. Although I would rather like to see a better ghoul development and the Commonwealth. Maybe all will come with FO4, but I don't think we will see it in New Vegas.