After every episode I felt depressed by the end.
I think this is what made the show what it is. They didn't find a way to maneuver things into the happy ending that a lot of shows do, instead of giving me the sad truth that I thought wouldn't happen, but it does.
Perhaps that is why I didn't enjoy it: in each episode I anticipated the unhappy ending so I found the show very predictable.
That's very true!