Actually... a few more gripes that Yahtzee didn't touch on
The quest system was beyond worthless. There were seriously like 150 side quests to scan a random planet, and it almost never told you what planet... or it gave you the planet name, but not the System or Cluster... so you have to wander around mindlessly scanning everything till you see it. My personal favorite was the book of Plenx (I think that was it, some religious text for a Volus) that isn't even available to find when you get the quest. Seriously, the Cluster in which it resides is not on your map until 2 or 3 Priority missions later. An NO WHERE is that mentioned. I cruised around for like 45 minutes looking for that damn thing before I just googled it.
And once you do find the planet with the MacGuffin, you don't actually DO anything to get it ... it's just, got. I had a quest to extract some pinned down mercs for the shadow broker. Sounded sweet! I'll get to fight along side some Batarians maybe, or Vorcha, or whatever, Shadow Brokers merc squad sounds freaking coo-.... probe and done. WTF is that. I launched a probe and magically they're extracted. B.S.
And after you've probed the Volus's MacGuffin (if you know what I mean) you fly back to the citadel and just look at your map... every person named "random person" is a completed quest. There's absolutely NO impact or engagement there at all. Talk to them get +5 war assets (or -5 a few times... oops) and you're done. You're not even required to stay and listen to what the say. Hit A as you run past and you're set.
These stupid fetch quests are worse that the "Gather 20 bear asses" quests from standard MMOs
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Finally, more on the ending. Where are the old squadmates for that bit? All the cameos from the story line ... and nothing in the Huge Finale. Why can't I have just a quick clip of Grunt or Wrex (OR BOTH) leading a wave of Krogans... gunning down husks and generally being badass Krogans. P.S. Wrex is a Vanguard. Give his ass Biotic Charge! How about a quick mention of Jack's students if you saved them. Imagine: you're pinned down, omg what ever will you do. *BOOOM* Biotic artillery strike saves you (or the students show up to provide barriers, depending on what you chose.) How about we see Jacob being a proud leader guy, directing troops and giving orders. Simple things, could even be just cut-scenes. Wouldn't fix the whole thing, but would have been a step in the right direction.
I'd offer a suggestion for Miranda, but we all know the camera would just be glued to her ass the whole time anyway.
And while you're adding things to the final battle, can we at least throw in some token aliens. You got the Batarians on your side? Sweet, see them running around killing things in London. Vorcha? Quarians, Geth, Krogans, Slarians, FREAKING HANNAR and ELCOR. Nothing major, no huge investment required, just acknowledge their existence. Reuse models, draw it up in MSPaint for all I care. Just pretend like they matter, a little bit. I've spent the last 5 years getting them to play nice for this one major climactic battle... can they at least make an appearance? That's the whole point of the series, right? Everyone coming together, putting aside past grudges to combat the Reaper threat.
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Okay, one last last thing ... Some say he's the strongest of the reapers, and that he wants to harvest Shepard's body to dress you up in lacy womens underwear, all we know is: he's called HARBINGER, and he's relegated to less than a cameo in this game. WTF. He spent the entirety of ME2 taunting you, following you, taunting you some more, and annoying the bloody piss out of you until you roll Infiltrator and just blast his stupid head off while he does the possession animation thing ... and in this game, he gets mentioned once in passing by some other reaper you just destroyed, and is accused of blasting you with a giant lazer beam at the end. I'm still skeptical of that last bit, because after all the fuss he made in ME2 about gathering up your body... well now your body is broken and bloody on the ground and he just doesn't seem to give a crap anymore. Did he even have any lines? I can't remember him saying anything... but that might just be a natural response blocking out painful memories.
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As for the whole red/green/blue thing ... well, fixing that is going to require *MAJOR* help that I can't be bothered to offer at this hour, and BAC.