Ever since I got this game since Tuesday, I have been playing it non-stop each day and this game is great! The Gearbox team is hard at work on a patch to fix some of the bugs, but overall the presentation is great and slick.
However, when playing the game you have no idea if the mission you are on is a main mission or a side mission. With 130 side missions, and approximately 45 main missions, do you want to spend your time on a side mission when you could be doing a main mission instead? Below is a list of the missions, and I take no credit for it.
You can thank user Deadeye_Leone here.