Not Philip K Dick’s finest work. It has lots of interesting moments, and all the elements that make Dick amazing are there, but… somehow it just doesn’t seem to coalesce. Almost all Dick novels follow a pattern, in which a number of small stories are set up in a very strange future reality. The stories are advanced as they bounce against each other, ultimately coming to some sort of resolution. When this works (as in Dr. Bloodmoney, Do Androids Dream of Electric Sheep?, and The Man in the High Castle) it’s magnificent. It’s that part of Mozart’s 40th where suddenly all the melodies intertwine and change.
When it doesn’t work, it just feels confusing and discordant. I’d put Martian Time-Slip in this category. Worth reading if you’re a fan of the author, but otherwise probably not.