Every scene involving Kai Leng was stupid as fuck too.
Kai Leng was a character that never should have been introduced in the game series. He was fine as an antagonist in the books, because most people aren't going to bother with them, but shoehorning him into the last installment with no introduction or background seemed really fucking stupid to me.
The thing that, it would seem, a lot of folks glaze over is that the writers of ME3
turned the Reapers into idiotsin ME3. Vigil, in ME1, laid out exactly how the Reapers beat the Protheans. They came through the Citadel relay and immediately took control of it. Since the Citadel controls the mass relay network, they were able to shut down all the relays, dividing and conquering the Protheans in one step. From there they went system by system over the span of about a 100 years, wiping them all out.
In ME3 they enter the galaxy and what do they do? Do they head straight for the Citadel and take control of the relay network? Nope. They go after Earth. Why? There's no explanation. All they had to do is take over the Citadel, which would have been easy for a Reaper fleet, and then they would have won the war. Instead they go to Earth, then split up and screw around so Shepard can build forces to fight them. And then, at the end of the game, they finally get around to taking the Citadel when it works for the ludicrous story Mac Walters and Casey Hudson pulled out of their asses.
The thing that really cracked me up was the Extended Cut DLC. They tried to shine a turd of an ending by making it even harder to believe. The Normandy lands right in front of Harbinger, as he's shooting the fuck out of everything in front of him, but he doesn't take a shot at it? A big target like that. A well-known target like that. Sitting right in front of him. He does nothing.
Based on all of this, I'm glad that Casey is leaving. The more I see of ME4, the more it looks like it's going to be a reboot of the franchise, which might not be such a bad thing. Get some fresh blood in there that hasn't got baggage from the previous trilogy to fuck this up. Granted, it'll also give them the opportunity to fuck it up in many new ways!
ME4, or whatever they decide to call it when it releases, should hit shelves around August 2016, so I guess we'll all just have to wait and see.