We had Jake last Christmas, and we didn't have any problems with him. We did have to watch closely when we were opening gifts, though. He liked to try to take the wrapping paper and run with it!
He never bothered the Christmas tree, but he did like to look at it. He really enjoyed Christmas when everyone was over, he was so excited! And, he LOVED that he was allowed to open up his gifts. He didn't like when we would take the paper away, but he would still be happy when he saw a new toy!