I love the PokeNav, I think the new cutscenes breathe some much needed life into a lot of these characters (May and Wally especially benefit greatly from this), cute new waifus like Lisia and Zinnia and Soaring is fun and a great replacement for Fly and May finally gets a battle where her starter is fully evolved.
Of course all of this is mostly superfluous and I feel like the core gameplay is where ORAS fumbles the bag the most - almost every trainer in the game is easier than their original counterparts, despite being a mechanic introduced less than halfway through the game you can count the number of trainers who use Mega Evolutions before post-game with one hand, to go along with said early introduction of ME's you also get a free legendary and of course the EXP Share, which is probably at its most imbalanced in this game.
There's also some petty shit like why do I have to hold B to run while using the Circle Pad when that wasn't a thing in XY but I'm not gonna sit here and preten