I liked it. Like the books, it’s not for everyone, but I thought it was pretty good. I found myself laughing at Sam Rockwell’s Zaphod a lot more than I expected to.
Edit: Hilariously, I actually went to a midnight showing last night, which two theaters near me ran one of, apparently anticipating an LOTR style geek parade. There were like fifteen people there, in a huge theater. Not a good sign.