Love the entire series. My favourite game series and one of my favourite narratives in recent memory. I know I'm in the minority, but I genuinely love the way they concluded the story. (No, I'm not looking for a fight, that was just my honest reaction.)
Still, even with the best stories it can be fun to play the "Ooooh, but how would I rewrite it?" game, so let's go!
ME1
- Fix the inventory system. In general my comments aren't gonna be focused on mechanics but *good lord* the inventory system.
- Improve the writing re: Liara's romance arc. Not that Kaidan and Ashley's are the soul of subtlety and style, but Liara? It's clunky. She keeps talking to you in very technical terms about asari reproduction and sexual stereotypes and then suddenly there's an "unspoken attraction" between you. Sure, there's the mind-melding but if you play the DLC first that may not even have happened. I'd add a conversation or two where the characters get to interact more...humanistically than a "tell me about your people!" RPG-investigative-dialogue.
ME2
- Give guns stats again.
- Allow Shepard to initially refuse to work with the Illusive Man, and allow additional comments from a Sole Survivor Shepard. This'd be pretty easy to accomplish. Currently, the Illusive Man tells Shepard that the Council won't fund her and that he's her only option if she wants to investigate the disappearing colonies. Shepard then (perhaps grudgingly) accepts this. Later, Shepard goes to the Council and they do, in fact, refuse her. All you'd need to do is allow Shepard to tell the Illusive Man she didn't believe him and wants to talk to the Council immediately, cut straight to the scene where the Council do, in fact, refuse to help, and then there'd be better motivation for forcing the player to grudgingly accept that she must agree to work with TIM.
- Incorporate the Prothean Beacon into Shepard's resurrection. I have no issues with death-and-resurrection on a thematic level. It's fine, it's cool. But we lack any kind of information about how dead she was exactly and how long before her body was delivered to Cerberus. The Prothean Beacon could be used as a macguffin to explain why Shepard's brain was capable of being jumpstarted like a failed heart long after the rules of medical science would normally allow.
- Incorporate the Prothean Beacon into TIM's refusal to implant a control chip into Shepard's brain. The "because you're just so special, Shepard!" reasoning always felt very cheesy to me. Being afraid of garbling the only translation device for Prothean technology would be a much more pragmatic reason.
- Show Miranda's slow disillusionment with Cerberus. As things stand, if you bring her with you on the last part of the suicide mission, she hands in her resignation to the Illusive Man, but it's not really clear why, since every time you told her about terrible things Cerberus did, she defended them or claimed them as isolated incidents. If you don't bring her, then you don't even know that she's thinking of leaving until you get to ME3. A conversation later in the game where she starts expressing doubts would help.
- Change the human-reaper boss fight. The concept of the reapers making new reapers out of species is so cool. But a.) they should make them out of every species they destroy, not just one-per-cycle (that would allow for all cycles to have minor victories over a Reaper or two without their overall numbers dropping), and b.) why does it look like an actual person? Why? It's so daft! That boss fight needs a serious overhall.
- Someone always dies on the suicide mission. Like Virmire, you can't get out of it clean.
ME3
- Put the Mako back in.
- Have Allers (or other substitute journalist) be more serious and sombre in tone. Reporting like a war correspondent, not a games expo presenter.
- Mention Emily Wong's heroic death in a codex entry or radio transmission or conversation somewhere.
- Replace Kai Leng. He's a terrible character. Make him someone we're actually invested in. What if Jacob didn't escape Cerberus and he'd been indoctrinated and was chasing us down. What if JACOB could be the one to kill Miranda? I mean, Jacob's character is probably the one that gets shafted the most in terms of character content. This'd be tragic, but...at least dynamic. I think it'd make a better story. I am also slightly hesitant about this playing into the Dead Bro Walking cliche - that's a valid reason not to do it, especially considering Anderson. I have no problems with Anderson's death because it much more clearly fits into the dying father-figure trope? But if it happened to both of them it might start looking like a pattern. Still, I think on its own merits it could be awesome so if those concerns could be addressed by adding or shifting the identities of other characters, or by adding an option to save Jacob at the end, I still think it could be a good idea.
- In the control ending, I'd make it a little clearer that the mass relays overload but don't actually explode. Currently it just cuts the animation sooner, whereas holding on a not-totally-destroyed relay would make this more clear.
- In the original ending, if you started down the road to one of the choices, and then turned back, you'd get a fail-screen saying you took too long and the crucible was destroyed. I'd change this so that it also just started a flat-out hidden counter. If you take more than, say, two minutes considering your choice after concluding your talk with the Catalyst, you also get the fail screen.