He has done a respectable job considering the scope of change which was needed. All that 'project' talk over the last few years was effectively erased last season, and we had to start from scratch again.
As proven last season, new signings count for little if the coach cannot get the best out of them. With the exception of Chiellini, Marchisio, ADP and Trez, I really do not know what to expect of our squad, as none of them have performed consistently at the top level.
DN will play a critical role in terms of making players like Amauri, Melo and Diego play to their full potential, nurturing players like Bonucci and Motta into established players, and utilizing average players like Pepe, DC and Iaquinta in ways that can benefit the team, despite their limited ability.
In other words, Marotta could make Real Madrid like signings and it wont matter unless DN delivers. We have the squad to secure a CL spot, now it's Del Neri's turn.