Everything in the game to a degree, was based around talking people into/out of actions, yet the end game, the FINAL decision with a new lifeform/reaper/catalyst/whatever it was, that is responsible for EVERYTHING in probably 150-200hours of gameplay.......... and you can't talk to it?
Crap choices ignored, not being able to talk to it AT ALL is the single worst game decision I've EVER seen. Who are you, who made you, why are you convinced synthetics will always destroy their creators(when more than one major game storyline is reaching peace with synthetics), and a million other things. Not being able to talk the guy into a "better" ending, or some reasonable logical endings is absurd.
Someone also said the build up was brilliant to the end but, personally I thought the whole, we'll land, destroy something lose 60% of the forces trying to land, and just have a rest. Earth is completely occupied and Reapers can land anywhere and kill just about everyone almost instantly...... but somehow the whole crew(bar Joker) is planetside and standing around... then magically back on the ship.
The whole "reapers are super powerful and can take over a system instantly" but then take their times and somehow at first there is no defence from them at all, but a resistance lasts...... well theres basically zero indication of time from start to finish of the game, leave earth come back, days, weeks, months later, god knows. Reapers ripping Turians to pieces, the Turian homeworld is ON FIRE ALREADY, but they are banging on about if they lose the moon.... they'll lose the homeworld. The Turian fleet can't fight the Reapers but stay there dying... and still have a massive fleet later in the game?
The end was horrific in so many ways that made the ending completely at odds with everything Mass effect, but the background story of ME3 just made no sense, had no scale, and was completely illogical.
Oh lastly, I have to stumble/slow walk for AGES, but once I start firing I can suddenly stand up straight and walk fast, or RUN at a beam of energy, eh? Also, bullets, they do SOOO much more damage when standing up tall and standing right next to the thing you know will explode? I'm firing at something I am trying to blow up.... so let me walk closer to it.... who, why, what, when........... so stupid.