They were entertaining, no? That's what a TV show is supposed to be. It's not heart surgery.
Some things just didn't matter and were put there to made us think, some were fillers, and there were obvious holes in the whole series, but in the grand scheme of things, some things just didn't matter.
The 'big things' (ie the numbers in S1 and 2 and more - Dharma in S1 to 5 - Smokey was always there - Jacob in last few seasons - the island and the protagonists in all seasons) were all explained. So, of course the other seasons mattered.
So what if some small details weren't explained in full and made you use your brain a little?
Seriously, people complained about Vincent... it's a bloody dog, who cares where he was or what he did all these years??? Same for a million of other little unexplained things.
Do you read books? Would you rather have a finale or a series of episodes where every little tiny detail is explained? Would that not kill the very essence of what made Lost special, ie making you think and wonder? If that happened, people like you would be the first in line to complain about all the explanation had 'dumbed down' the show.
I like to be able to think about things my own way and not being fed every little explanation in a story.
If you weren't able to enjoy the series finale (or the whole of S6) then i do wonder why you watched Lost in the first place.
Did you really think that we would have someone come up and tell us the equation of what made the island special? It's pseudo-scientific-religious at best.
Or what and why every single character in the whole series did before, during and after going to the island? Or why Walt - who's been gone for 4 bloody years - wasn't in the finale (which you can infer yourself, if you really wanted)?
I watched it because the interaction between the characters, the mysteries, some action here and there, were gripping and made me think, and obviously made me want more. Explaining all of those mysteries would have simply ruined everything.
That's what Lost was all about. You quite obviously watched a different show in your head, otherwise you'd have stopped watching it a long time ago if you had realised that not everything would be explained.
A show like Desperate Housewives, which has a lovely voice over which invariably explains to the viewer- at some point late in each season - the very mystery and Big Secret of the season, after the viewer got the same conclusion a fair bit earlier on - would be more appropriate for some people.
