Overall the weapon tuning has great changes. Big points that have needed to be addressed since the games launch are finally getting attention.
The AR nerf is barely anything, you're not gonna really notice a mere 2.5% less damage per shot. If you're just in the mood to "sit back and play", you're probably not caring about damage output anyhow. If it does bother you, liquor is always there to help you through these hard times. Cerberus Vae III sober is not something anyone should have to do, guys.
EDIT: forgot to mention that they did say the AR nerf is averaged across Rate of Fire stats, higher RoF took less of a reduction than low RoF.