When I was a kid (long ago), I saw all four "Herbie" movies, and I can remember being kind of underwhelmed by them even at that tender age. In fact, I thought the last two of the original four were really lame. So I made it a point to avoid "Herbie Fully Loaded" when it came out. But it came on television recently, and I decided to give it a chance since I'd be seeing it for free.
I was surprised. Now, I will admit that the movie has its share of flaws. It doesn't explain why Herbie, in the time between the previous movie and this movie went downhill as a racer, and why Herbie had been forgotten by the racing community (and its audience) - you would think a Beetle that kept winning races would be remembered by SOMEONE! I could go on with listing its flaws, but I found its charms outweighed its flaws. For starters, the protagonists are very likable, down to earth and not annoyingly goofy. And Dillon's character of the rival racer was not broad and instead more of a realistic villain.
The special effects are a mix of "old school" effects like the original movies used, mixed in with CGI. I actually found the combination worked, blending with each other well.
I'm not saying that this is a movie to actively seek out... but if you come across it while in a silly mood, I think there's a good chance you'd find it an agreeable way to pass the time.