1. Inability to holster weapons. 2. Lack of hub worlds. There are none except the Citadel. 3. Saving the Council or letting them die meant nothing. 4. Saving the Collector base or destroying it meant nothing 5. Saving or killing the Rachni queen meant nothing either 6. Rewriting or destroying the geth heretics meant nothing 7. Dead characters from ME1 and ME2 are usually replaced by new characters who just fill out their role. The story remains almost the same. 8. Lazily done confrontation with Jack if you don't save her at Grissom Academy: Phantom Jack 9. Bioware missed the opportunity to make a Neverwinter Nights 2 style trial at the beginning of the game. You could have gathered evidence and witnesses to confirm the existence of the reapers and prove that blowing up that relay was necessary. You'd go around talking to people. It would be a great chance to introduce new players to the lore and the universe. Us, the old fans, would get the chance to see what 22nd century Earth looks like in peace, and walk around and see what we are going to fight for. They should build-up some tension prior to the reapers arrival and make it truly scary and frightening. 10. Dialogue wheel is used less often than in ME1 and ME2. And when it appears the neutral option is very rare. 11. Running animations are sloppy. 12. Boring side quests and badly sorted out journal. 13. The Citadel is the center of galactic civilizations. It has one of the strongest fleets in the galaxy defending it. It has 200,000 C-sec officers, civilian militia, thousands of armed criminals, civilians who would arm themselves, thousands of soldiers who escaped the fallen worlds. And in the game, all of the sudden, you are informed that "the reapers just took the Citadel and moved it to Earth" like it's nothing. This event needs at least 3 minutes of cinematics. Although these can be justified by the lack of time or lack of budget, it would be nice if ME3 didn't have these issues. If you think of any, feel free to mention them.