No he doesnt have to justify anything to you - he liked the ending, some people did. Accept it. Seriously, i like how if someone likes the ending he gets ridiculed by everyone on here.
I just finished the game for a 2nd time and its fantastic. I put about 33 Hours in my first run, 27 on insanity and about 20 in multiplayer - its a great game and worth all the accolades it received rather then the extremely vocal minority who say its terrible because of the last 10 minutes.
He doesn't have to. I can't force him to, but instead of of just coming in here and saying that you liked the ending doesn't generate discussion. You are just posting a drive-by opinion and that's not doing much. You can like the ending, but give us reasons why. Sometimes, we just want to understand. Sometimes we just want to debate. I will say that to date, there has not been a satisfying explanation for why people think the ending is good.
And no one is saying that the entire game sucks because of the ending (although endings do matter.) Most people agree that the game is great up until the ending. And this is not a vocal minority, but a vocal majority. The ending is almost universally hated. In fact, we have many examples of people thinking that the ending couldn't be
that bad, but then they finish the game and agree with us.
If you get mad at the supposed circle jerk that is going on within this thread, well tough titties. Either post to break it up or leave. Be prepared if you do want to post, however. Some of us has been through many cycles in this thread.
No, in the Arrival DLC, you are shown what happens when you slam an asteroid into a working Mass Relay. My first impression of the ending was that the effect of generating/transmitting the energy wave throughout the galaxy to stop the Reapers kept the Mass Relays from exploding. I highly doubt Bioware meant to destroy every major system with a Mass Relay so I make my conclusions based off of that assumption.
The codex explains what happens when a relay is destroyed: it goes supernova. And my argument is that we should default to the relays going supernova until we get told otherwise by Bioware. They established the rules for this universe and if they choose to break those rules, they must explain it or else it just seems like they are pulling stuff out of their asses.
It is a staple of any fictional universe: Bioware created this fantastic universe and established rules that govern it. They explained how the mass relays work, how mass effect work, and so on and so forth. They even started talking about blue-shifting emissions. They gave the basis of a somewhat hard sci-fi universe and it made the ME universe a lot more believable. If they start to disregard those rules, the universe they created will fall apart.