I can see the barriers putting people of, I had a bit of a "huh?!" moment there myself. Then I decided that I liked it.
Maybe your friend didn't like that type of "happy" endings?
From your comment I gather that Fate/Zero is something to be watched? I'm a bit in two minds of it since I acquired a fan-translated version of the light-novel and don't know if its better to read that than to see the animé adaption.![]()