I thoroughly enjoyed it. I really loved The Martian, and although Project Hail Mary was less grounded in "hard" sci-fi, Weir's writing style was compelling as ever (on a related note: I had to take a day off work when I read Artemis). He's the only author I've read who can capture in writing the excitement that you get when you make a breakthrough in the lab or get into a flow state fixing a broken gadget.