Yes I believe Fiori has lots to offer. It will take time to explore the available apps. I believe since we have been running SAP for 15 years it will take time for our traditional users to adjust to Fiori. I even think it's way to advance for the user level we currently have so we might not even give them access to Fiori. It will be for managers and above and/or power users.
So going back to the traditional GUI reports. Most of our existing reports were customized in ECC 4.6c and so what we're trying to do now is find the available standard reports which can cater the business requirement without needing to create customized new reports. Standard reports I believe can cater around 80% of our requirement rest will have to be developed as our production system is Japanese based with different interfaces.