Before watching the movie:
As I recall, Armageddon and Deep Impact both came out at about the same time and both concerned averting an asteroid collision with Earth. Likely neither one of them takes precedence over the other, but in my mind, this one is the original and Deep Impact is the imitator.
I only just now learned this film is directed by Michael Bay. I knew he had Hollywood films before Transformers, but I didn’t think it was anything I’d heard of. It only reaffirms my expectations though, since I was already expecting great spectacle without much depth. However, I worry it might drag somewhat, since it’s an hour longer than most movies of the caliber I’m expecting. Unless there are flighty songs or weighty angst, movies don’t tend to have more than 90-100 minutes of content.