Others might say "annoyingly evenhanded" and still others would describe it as too in favour of one side or the other. There was one chap demonstrating outside with a placard saying that a disabled man had been murdered by terrorists for being a Jew and that we patrons should "enjoy your evening at the ENO". A woman told him that she had seen the opera before and that he should see it for himself and she offered to buy him a ticket. He refused. John Adams has a huge reputation as a very accomplished composer. The librettist, Alice Goodman, was never commissioned again.
UPDATE: here's the first review I've seen. It's from The Guardian's Andrew Clements:
In the event it all passed off quite peacefully. The demonstration against the staging of The Death of Klinghoffer that had been predicted in some sections of the press appeared to be limited to one person standing outside the Coliseum and brandishing a rather small poster, and at the final curtain the composer, his work and English National Opera's production were all warmly received.And it's one in the eye for the lobby. Zionists have worked hard to have this either not performed at all or panned by the critics. Andrew Clements's review judges it purely on artistic merit.