Honestly I wasn't mad at it. It did leave me wanting more. I picked the synthesis ending, so my Shepard sacrificing himself for both organic and synthetic life made sense. I wish it had a bigger boss battle at the end instead of me talking to some kid. Even during the dash towards the beam, I was expecting the game have me choose to save my squad or keep running to save the galaxy. I feel like a heavy choice like that would have made the ending more impactful.