In the early 80s, having loved TAS and "The Slaver Weapon", I sought out Larry Niven's "Ringworld" (and "Tales of Known Space") because I'd run out of ST novels and I realised there were kzinti to be found within its pages. A few months later, "Ringworld Engineers" came out in paperback, and I was in seventh heaven.
I had a chance to meet Larry Niven in Sydney at a convention, and then chat with him at a book signing, and found him to be humorless and abrupt, with a boring, dry delivery that I just couldn't equate with the liveliness and pace of his SF writings.
However, a few years later, I ran into him again at a different convention. This time he was in the bar. Laughing, joking, telling anecdotes. Wonderful! Like a totally different person. So don't write off an author on one brief, underwhelming encounter.