If I may add to this, have a look at some posts on the "Welcome Inter Milan Fans" thread, which deal with the same subject and you'll see there are mixed views between Inter fans too. I'm one of those who thought that sacking Mancini after winning three championships in a row was total crap on the part of Moratti, but with hindsight I have to say that probably, after Liverpool that year, he was no more in control of the dressing room.
On the other hand, I also think that Mou is just living on the foundations laid by Mancini and in CL his performances (at least so far) are even worse.