I just watched the English translation of this movie, and I don't think it was as bad as people made it out to be.
Of the three live-action Asterix movies, none has really come close to capturing the charm of the comics (or even the animated features). "Mission Cleopatra" came closest, I think. The first movie was just miserable.
"Asterix at the Olympic Games" was a fun, if not perfect, attempt at capturing the magic of the books. My biggest complaint was that although its an Asterix and Obelix movie, it doesn't really seem to be about them. They don't even make an appearance until about 15 minutes in. It lends a certain degree of ridiculousness (and not in an amusing way) to the movie to have this enormous title screen that says "Astérix Aux Jeux Olympiques," and then have the entire opening act of the movie be about someone other than Asterix.
The CGI in the movie was also off-putting. Its used to make many of the more cartoony effects of the film, which is good, but it was really over-used in many scenes that didn't require them. Also, it wasn't really good CGI either.
The plot was nothing special, but it was amusing. It had some good jokes, and the characters were pretty fun. It was nothing like the comic ("Asterix at the Olympic Games") which it was based on, but I didn't expect it to be.
There were, apparently, tons of guest appearances by European (I think) athletes, none of whom I recognize -- being wholly ignorant on the topic of sports in this country or any other. I think these probably stuck in the throat of many people, who might have known who they were.
Anyway, I think they are starting to get the hang of how to make live-action Asterix movies, but I really do wish that the story had been more involved with Asterix, himself.