I am so glad somebody started this thread (Call me a coward for not doing it myself.) These games are downright painful to watch. I don't mind missed shots, that will happen, and as long as they are good looks, you can't ask for much more. However the mistakes, both on offense and defense, are simply not what we are familiar with for this team. I don't have the answers to what is going on, but the games are receding from truly enjoyable entertainment with every game.
I am 53 and I've been watching the Celtics for a long time. For me, the best era was the 80's but I can vaguely remember as far back as Cowens/Havlichek. One thing I have learned is to not take losses too seriously. That is, don't let it affect the rest of your life. This is only a ****' game. Get your anger out during the game, swear at the TV, scare the cat, throw stuff if you have to. But once it's over, move on. You'll be better off.