I'm a bit of a sucker for those kinds of movies, (examples being 2012, The Day After Tomorrow, Deep Impact) so I wonder how you all feel about those kinds of movies in general.
For me, it seems like the movies kind of let it off easy on the disasters in general, in that there always seems to be survivors in the end, which leaves me unfulfilled at times. I can't recall seeing a movie where everyone is actually killed off by the end. Can't a disaster actually be the winner in one of these movies for once?
The plots of these movies are also baffling at times, but the way I watch them is to disregard everything about the plots, and only watch for the action scenes of destruction and death, which seems to make it a lot better.