This is not a substitute for watching the original series so you can experience all of Code Geass seasons 1&2 in just 3 movies but if you watched the show years ago and want to relive the experience but don't have time to marathon 2 seasons of anime then this does a far better job than most condensed to movie adaptations. The stuff it leaves out/covers in less detail is generally very well done so the movie has a nice flow and still covers all the important developments. However they made one glaring mistake when it came to deciding what material to cut. This movie cutsout almost every interaction anyone has with the characters Shirley and Euphemia which is a massive problem. The relationships formed between Lelouch and Suzaku and them are incredibly important to the development of the plot and if someone were to only watch the movie version they would have almost no idea who they are or why they are so important and beloved. The sad thing is it would have been such an easy problem to fix by just extending the movie's run time 5-10 minutes.

For reference I gave the original show a 10/10 because even though it isn't perfect it was just so much fun to watch and I gave the movie an 8/10 because they left out the heart of the show by cutting out any emotional developments.