The first three one aren't the best. Even the original one is low rated on Rotten Tomatoes. But the last three ones Ghost Protocol, Rogue Nation and Fallout, are SO MUCH BETTER. (They all are rated over 93% on Rotten Tomatoes, and Fallout is 98% amazingly, I have never seen a sequel which would do so good). You should definitely watch the newer ones.
@EmperorDuckie They are definitely movies which deserve to be watched
Edited For Double Post - BioKnight