I enjoy most war movies, especially WWII, and I've seen probably every one of note (including John Wayne and Audie Murphy turkeys), and many others. This one did pretty much nothing for me, which I found surprising, especially given the context of UBoats owning the shipping lanes. Compare it even to an old flick like Dam Busters, which had in common with Greyhound the Allies trying to solve a problem of significant technical difficulty. Greyhound simply didn't have the gravitas I expected.
That said, since a couple of you feel strongly about the movie, I may watch it again this weekend. But first impressions are, well, first impressions. Anyway, my original point was I wondered if Hanks & Spielberg would do a Navy flick since they've covered air and land. And Greyhound ain't that, nor anything near the existing three H&S series.