If all you desire from Italian food is a platter of noodles covered with a watery white substance there are a wide variety of restaraunts in Bangalore which will make you very happy. IF, however, you are interested in actual, high quality Italian food your options narrow a bit. Well... more than a bit: Fiorana and perhaps Italia are just about it. Mind you: this does not come cheap (though of course you can pay much more for quite mediocre food at one of the 5 star hotels) and genuine Italian food is not to everyone taste (as we have seen from several reviews floating around the web).
I would be quite interested in knowing how many have these reviewers have been to Italy, or perhaps they have and came back... shaking their heads knowingly: "these Italians have no idea how to cook there own food!"