Remember that it supposedly was originally just going to be a recruiting flick and kinda sorta turned into a feature length motion picture almost by accident.
If you approach it as basically a string of vignettes that show "Look, HALO! Look, SDV! Look, night-time direct action! Look, VBSS! Look, sneaking around in the jungle! Look, Boat Guys! And guns, guns, guns!" and tie it together with a thread of a plot and a reminder of sacrifices at the end, and not an actual story like For Whom The Bell Tolls or whatever, it holds up a lot better.