Main Event Scene
Added - AJ Styles, the Miz and Sami Zayn to Seth Rollins, Drew McIntyre, Bobby Lashley, Baron Corbin, Braun Strowman
Lost - Roman Reigns, Elias
Other Notes - Dean Ambrose didn't renew his contract, Brock Lesnar disappeared, vignettes airing on both shows for Bray Wyatt
Before - B+
After - A
The biggest immediate changes in WWE were the swapping of Roman Reigns and AJ Styles. Styles joining Raw allows for several new feuds with the likes of Sami Zayn, Baron Corbin and Drew McIntyre. Several other potential feuds for Styles could be Cesaro, Lashley, Bray Wyatt (if he stays on Raw) and Joe.
The Miz is now a face and also adds a different dynamic to Raw now that he can feud with several heels like McIntyre, Lashley or Corbin. It's also a stabilizing move because the Miz can be counted on to hold the mid-card division together if needed or stick around in the main-event scene as needed.
Another big change appears to be switching Sami Zayn with the departed Elias. Elias was mainly used to have superstars interrupt him during performances. But due to his departure and apparent move up into 'McMahon confidante' status, a spot was opened.
Corbin, McIntyre and Lashley have been portrayed as the top heels outside of Lesnar, but with Lesnar out of the picture at the moment and Lashley potentially looking for another MMA fight, someone else was needed to help oppose the faces like Rollins, Styles and the Miz.
The uptick in grade is mainly because although they added several new potential feuds with AJ Styles in the mix, the dynamics of a smug, heel Zayn and a face Miz allows Raw to explore some different main-event storylines. WWE can do better than Reigns chasing Lesnar and Corbin, McIntyre and Lashley facing the Shield in 15 'final match ever' contests.