So much I could rant for ages but TLDR: It's one of the most insultingly easy games I've ever played and it removed features from RSE for no reason, like Safari Zone, the Pokeblock game, the Battle Tower/Frontier, Trainer Hill, Game Corner, etc and offered no replacements for any. Not to mention, the Contests (The second quest of sorts in OG RS) are so easy that they can be broken in half with spamming rainbow pokeblocks when before they required extreme and careful planning with your moveset.

Compared to HGSS which added so much new and refined so much old, ORAS feels beyond lazy in comparison and I actually think LGPE/FRLG are more faithful and suitable to their OG games than ORAS ended up being, as it didn't really know what it wanted to be (New version of Hoenn with improvements like Soaring, Devnav, ETC, but also a dumbed down autopilot game with no challenge or anything extra to do) Masuda was mainly to blame for the dumbing down aspect, which is why people really hate him and why they didn't like LGPE's direction (but it seemed it was more focused there, unlike ORAS where it dumbs down tons of stuff yet makes Regigigas so damn cryptic you NEED a guide)