The conclusions the dude makes in this video are basically on the mark.
The people who write off ME3 ignore all the good and sometimes incredible moments the player experiences in it. It's not a perfect game, and it has several face palm worthy moments, but overall, it was a pretty awesome game.
Calling it imperfect is like calling a hurricane a breeze.
"Is it really worth throwing away all of the the good of the series all the hundreds and thousands of moments of laughter and suspense and beauty and horror that construct the 60-200 hours experience of playing Commander Shepard across the whole trilogy?".
Sadly, yes. But what's really sad is I didn't throw it away. Bioware did. I didn't want to feel this level of disgust. Bioware decided that no matter how much of a difference Shepard made, it didn't make any difference. What does it matter how much laughter is in the universe when it must inevitably end in horror? Why should I care about the beauty in the galaxy when I'm going to be forced to burn it all?
The ending is so bad (yes even with EC) it makes the trilogy feel an exercise in futility. Why do I want to take that journey when it invariably ends up...there?
Is it any wonder many people prefer to end the game with Citadel instead of that ending? It makes no more sense, but it feels more like a reward for completing the game.
Will I buy any future Mass Effect games? That depends on whether they can give me a reason to trust them again. And we can start by pretending ME3 never existed.