I went into
Lost thinking it was sci-fi, but in the end, it was all fantasy. So for me,
Lost never really answered its core mysteries and that was before it threw in the whole purgatory flash-sideways stuff. I did actually start to lose interest because it felt like the show was stringing us along, but hung in there for answers. Instead I felt like all I got were narrative dead ends and then a conclusion where most of them die. It was immensely unsatisfying.
(I'm reflecting back now on 15 year old memories. I'm actually surprised to learn it aired from 2004-2010. Gosh, I remember this as being a show from the 90s.)
It's also not like there were a lot of options for other shows to watch at the time. I'd never stay with a show like Lost today. I punted on Yellowjackets as soon as it started bringing fantasy into the story.
You have to know that how a series wraps up is important to its viewers. A great or terrible finale can make or break how a show is later perceived. The Lost finale was the most disappointing of any show I've seen.
Great finales I recall are The Americans and Justified.
A terrible last book chapter or poor movie ending can ruin all that has come before for me. When deciding whether to read a book, I'll read the last chapter first. Spoilers don't ruin good stories for me. But bad conclusions do. And Lost's conclusion was just terrible. I'd rather it have been canceled.
It's not like I need literal answers for everything. I love Mulholland Drive. But I felt like Lost spent six seasons just jerking me around.
$0.02.