I cannot agree!
Let me compare this with A Princess of Mars. More and better science, poorer plotting and writing. The aliens are just as improbable in either case, and the hero as unstoppable. I'm finding it tough to finish.
Piper has written some very good books but I found this to be a snoozer, requiring judicious skipping. I plan to stick with Fuzzies and Paratime in the future.
A tensely-written tale that is a good companion to The Man in the High Castle. Should be better known.
A really cute story by a talented writer. "It's for the birds," and I mean that sincerely.