You were referring to the "mess" Bush inherited "from day one" ... 9/11 and Katrina occurred much later than his first day in office. There wasn't much of an economic mess, either.
Now if you want to refer to the events that happened on his watch, I won't disagree with you. But I would say the situation Obama inherited (two wars, one of which was totally unnecessary, and an economic mess) was worse than what Bush came in on.