Lost was fun and thoroughly enjoyable IMHO. Lost may have left some things unanswered, but, nonetheless--Lost was fun. A lot of fun! So I guess I will be watching The Leftovers!5. It's one of the best shows I've ever seen.
I'd suggest watching the first two episodes. If you can't get into it by then, it's probably not for you. I was hooked by the end of episode 2.
It's similar to Lost. If you hated Lost and how it didn't give you all the answers, you probably won't like The Leftovers, either.