Uh, no, sorry!  As a grown adult, I am fully capable of resisting myriad temptations, including, but not limited to those involving iPads.  I've taken it to many public places and never even been tempted to block anyone's view of anything.  Unless, it is now Dis-Rude for me to "block" your view of my daughter hugging Alice after we've waited in line to meet and greet.  Obnoxious? No, it's a device.  People are obnoxious and they are everywhere and some of them have iPads in the park and some do not.