I started reading and collecting all the movie tie in comics, John Barber did a very good job with the earlier comics, making the awful RotF stuff more coherent.
The first two movie comics were good at showing you what the original stories were going to be, and both adaptations were far more sensible than the eventual movies themselves. Some of the tie in ones were okay too, reign of Starscream was decent.
I gave up after how bad RotF the movie was and after realising I hated the aesthetic of the designs and the human focus that later sector seven comics took, where there was barely any robots and nothing interesting going on.
I believe that the tie in comics continued to fix errors made in DotM but I couldn't care less.
If you find a collection of the UK Movie magazine comics, steer clear, they were terrible.
Looking For: Wreckers Saga TPB Collection (with Requiem)