Lord of the Rings isn't everyones style of movie...but it is one of the greatest film achievements of the movie industry. Between the use of miniature, superb acting, brilliant special effects, it is considered a good movie-despite any aspects of the plot.
Another point- just becuase a movie is long has nothing to do with the quality of it...
Just because a because they are similar...doesnt mean that the books and movies can't be viewed as two entirly seperate entities. and just becuase you dislike/like one will necessarily mean the same for the other.