I honestly think Nuno was suffering from burn out from his tenure at Wolves and needed some time out before he took another managerial position. In most press conferences etc, to me he just looked glum, passive aggressive and robotic.
He's a manager slightly lacking in charisma, going to a club with lots of players with big egos and most feeling they're better than they actually are. So yeah, the guy needed a break, an attacking mid, a few players sold (alli,winks etc) an ok back up striker and some more time, and things might of worked out quite different in how quickly he was able to establish his old identity.