I thoroughly enjoyed Future Diary myself. Great stuff, I understand why some people might not like it though. Let's face it crazy chick is crazy, but I like her.
I have mixed feelings about Future Diary, I mean the main character really made me mad, but I can't tell if that makes the anime good or bad. It's the most morally offensive anime I've ever seen, but that did make it memorable. I don't even think Yuki is a bad character, I just think he's a despicable person. This show kinda reminds me of Deathnote that way. They both star a cowardly, honorless, betraying, murdering male protagonist with a magic diary, a one dimensional yandere girlfriend, and aspirations of godhood. The main reason I kept watching them was because after suffering through all of Yuki and Light's BS, I wanted to see them get what was coming to them. And both series delivered. But then the OVA changed Mirai Nikki's ending. Boooo.