Ok, I understand your frustrations. However, if you look at that review again, you'll notice that the critic isn't just saying "LL sucks! BOO!!!" Rather, he breaks down the reasons why he dislikes the recording... makes them clear as day. When compared with other professional-caliber recordings, LL's recording falls short in all the ways the critic describes. Why should LL be exempt from comparison to other musicians of his caliber, of his technical skill? As you said, the technical skill is assumed to be there, so the ONLY criteria on which we can base our judgments, assuming the technique is there, is musicality -- musical substance, musical maturity, faithfullness to the score (and if at times there are moments of unfaithfullness, they should be warranted, which in LL's case they are not). If LL falls short of these things, why should we not discuss them and point them out?
Your argument with the politicians holds no water, either. It's quite absurd, really. It's not about how the politician "feels." Politicans represent the people. Political officers, therefore, must ANSWER to the people. All politicians SHOULD be criticized and their decisions studied and analyzed. These are important issues, and if you don't think you can handle it, you should not run for office, it's just that simple.
Likewise, as soon as you put out a record, you put yourself at the mercy of the public and the critics. If LL wants to put out Rach 2 on a major label like DG, he should play it well. When LL puts out a recording, he knows what he is getting into. He knows that his performance will be dealt with by the critics and the public alike. With that in mind, he probably should have thought longer before recording this piece, because it is clear from this recording (which I own by the way) that, at least in this particular performance, LL's take is not up to par. Maybe he DOES have the musical maturity to play it well, and this was just a bad take -- in which case, another take was in order!
Anything released into the public is open to fire. Period. You can disagree (especially if you've actually listened to the recording), but that critic had quite a few specifics that support his claim. If you feel LL's performance was good, in comparison with other pianists of his prestige, then go ahead and say so... but tell us why you feel that way. Give specifics like this critic did, otherwise you really have no point at all.