I don't remember TF1 being more boring than the other two, but Antenne 2 definitely had a block of Japanese cartoons in the afternoon. I'm pretty sure all three channels had state funding to some extent or another. They all ran commercials between programs. They would never interrupt a program with commercials. If you watched a movie, or even a TV program, you could expect to watch it all the way through without bathroom breaks. Popular contemporary American films were dubbed into French, but films that were considered more culturally significant (say, directed by John Ford or Akira Kurosawa) were shown in the original language and subtitled if necessary.
I was about twelve or thirteen when Canal+ came along. The content was scrambled so you couldn't really watch it without a subscription, but that's where the porn was, and you could tell what was happening on screen if you squinted right.
Then came La Cinq, the first completely private TV channel. Here, movies and TV programs were interrupted with commercial breaks. There was a lot of American programming and it was always dubbed, never subtitled. They played stuff like Knight Rider and Airwolf in the afternoon, so I put up with the commercial breaks which were still far shorter and less frequent than on American television.