I'm no fan of the methods Osteen uses, but that said, I don't think people who are piling on to Osteen are looking at the big picture.
First, I know someone who works for the church, and there was indeed flooding there... and they were unable to get from their residence to the church. It's not just as simple as "opening the doors to the church." There needs to be someone there to do that right? Then there have to be supplies right? If you bring evacuees in and there are not provisions for them, you're not doing them much good, especially when there are other shelters who are prepared. So what if those people who needed to be there to open the doors couldn't get there? Travel wasn't exactly easy around the city, nor was it advised.
Certain people were able to open their doors to evacuees, and that should be commended. That doesn't mean that those who couldn't or didn't do the same thing deserve to be bashed.
Basically, this is just another chance for those who hate Christians in general, or Osteen specifically, to blast those who they don't agree with. How about instead of trying to create and perpetuate outrage, we all just recognize what is going on down there and do what we can to help out?