In an interview with Tiki Taka, a Mediaset TV show, Walter Mazzarri , coach of Watford, who stand in eighth place in the Premier League, has got to take off the other stones on his experience at Inter, which ended with the exoneration:
Errors in my communication? “I have an idea, just that it’s better not to express it fully. In my first year there, it was a not normal corporate change, there was much to do. The new company sometimes did not protect the choices of the coach, so I found myself in some unwanted situations. I could not say quite openly because I had to protect society, probably with the press has raised some misunderstandings, but it is a profound speech which I would prefer not to speak of. It is not because you’re wearing Inter’s shirt that you’re forced to win but you must make an evaluation of the squad. During my period there this wasn’t clear, however time has made people understand everything.”
Then on the De Boer situation: “This is one of those cases where you can not speak from the outside, we do not know what they said to De Boer and who was contacted the first time. Sometimes it is the clarity that is lacking. They only know the truth there. It may be that De Boer had said to get third and failed to fulfill that promise, or the opposite, you can not tell.”
Returning to the purchases made by Inter in the years after his exoneration: “The transfer market makes the sports director and the coach, to sometimes take players who are good on paper, but then comes another coach who buys another player and here comes the misunderstanding.
A name of a player who I asked for? I had asked for many. I think of Kolarov, Luiz Gustavo, Rolando also that in the fifth could not be redeemed: to me it was a completely different market. I had also asked for Erik Lamela, but these players could not move at that time. When you first arrive at a club you shouldn’t be too much of a gentleman but simply say that there’s a need to buy 8 players otherwise you’ll finish 6th at the end of the season. After a coach has signed you can’t say everything out loud openly.”
Source: Tiki Taka

If I understand this strangely written article right, then I must agree with Mazzarri. The club is well known for not supporting its coach with the players he asks for and also known for not thinking about whether the coach and his playing style fits into the current squad he’ll have at his hands.
Clearly the squad was build to play with a 4 back line back then but Mazza is a well-known 3 back line man…
But these were the times of Moratti (he hired Mazzarri before Thohir got in), and hopefully the new owners have got better and cleare ideas on how to build the club – getting in coaches that would be able to continue the work the former one started ( just like we see it today, with FdB coming in continuing the work started by Mancini playing 4-2-3-1, and now with Pioli doing the same!)