You've read the "official" review and to be honest, I don't wholly agree or disagree. First, I like both Kristopherson's and Ladd's performances. They fit the characters nicely. The replay of the same sequence from another angle answers all of the questions about what is going on, and is the only thing that turns a rather short, straightforward featurette into a full-length feature.
Conceivably, more time could have been spent investigating the wreckage (and similar wreckages) before revealing the time travelers from the future. Also, why don't they fix these ripples, instead of trying to escape them?
So there are some questions. If I could, I'd give this one 2-1/2 stars, not three, but I won't drop it all the way to two, mostly because no one else has done this exact story, unless it was Rod Serling in the original Twilight Zone series, but I don't think so... there are similar stories, to be sure, and time travel stories, but not in this combination.
Which puts this film into the "Twilight Zone" category for me. There are so many places where they could have made this one better, I have to wonder why no one has done a remake...
Still, it is part of my collection and if you are SF buff, then don't leave this off your list of films to consider without at least watching it.