First off I want to say it's good to have a Madden game again that creating sliders doesn't feel like rocket science anymore....
I basically took a very conservative approach the past 3 years with sliders for Madden because quite frankly the game was broke and sliders weren't going to fix the issues no matter how much time and effort was put into it.
Having said that from the past few days I've had the game and played occasionally. I think Pro level just like any other level can be modified to render good results.
The reason being is because the AI doesn't get any smarter or adjust to your style of play regardless of the level. That because EA isn't going to actually put in any quality time making sure that happens.
They focus on Online gameplay and tournaments too much to observe human vs cpu gameplay...
I've played mostly with default settings basically just staying patient until I'm certain something needs to change for the long term results on Pro level.
I wish the FBG rosters were complete because normally I don't even bother with EA's stock rosters much at all. But it appears those won't be ready until October so I'll use the stock rosters to try and determine some base settings for now.