Absolutely not. OK, I'll say it. I loved the finale. I loved Season 6. In fact I loved all the seasons.
So, I'm guessing by the tone of the question, the sticking point was the sideways reveal. I posted some thoughts on this on the Season 6 thread near the end. It ended up at the bottom of the second to last page, so I'm guessing most were already done with the thread. Allow me to repost it here as it deals with the sidways topic.
Quote:
Originally Posted by Jedi Gnome 
Anyway, again I was thinking about the complaints of the Sideways world, like it was tacked on, the timing of it, why the island was underwater there. Sorry if this was mentioned or already implied, but let me offer this theory/analysis/fanwank:
The end of season 5, the Losties tried to introduce Jughead at the Incident in hopes of changing history, of creating a world where Oceanic 815 doesn't crash and lands safely in LA.
This place in the afterlife was created by the Losties' subconsciousness. It is an amalgam of their hopes and what they thought they wanted/deserved. This includes the hope that what they were doing in the season 5 finale "worked." That is why the island is at the bottom of the ocean and thus Oceanic 815 never crashes, as they had hoped. It is what they thought they wanted.
When they are "awakened," I believe they also realize how important the island was in their life. They all grew and/or found what they were looking for, things they would have missed if they never crashed. It is all part of them accepting their lives so they can move on.
So, why introduce it this season? Technically, since this afterlife is timeless, it could have been introduced anytime. It makes the most sense introducing it in season 6 since the end of season 5 showed the Losties trying to introduce the idea of a world where Oceanic 815 never crashes.
As for when things are happening compared to Island time, I like to think when we first see Jack on the plane in the sideways world and he has that...moment...looking out the window was when Jack died on the Island (last shot of the show). So, in a sense, Jesse was right and the whole sideways was an epilogue. But showing things in this order preserves the perfect bookend last shot.
The writers always said this was not an alternate world and not assume Jughead caused a time split. So was the submerged island a misdirect? Yes. But, looking back, it makes sense in the logic of the narrative. The writers wanted to keep us guessing if Jughead "worked."
The thing is, they laid out how time travel worked in this show. Whatever happened happened. There is one timeline. (Which I predicted, thank you very much, even as others insisted Jughead had to cause a split in the timeline). Locke always appeared before Richard in the 1950's, Sayid always shot little Ben, and the Losties were always at the Incident with Jughead.
And, I'm more convinced Daniel is actually trying to continue the time loop by telling Jack & co. to drop Jughead down the shaft and his waving the gun around the Others' camp.
So, the next time you rewatch "Orientation," and Chang pauses before saying "an incident," he is also talkng about time travelers (including his own adult son!) who warned him to evacuate the island and dropped a hydrogen bomb down a shaft drilled into an electromagnetic deposit before disappearing.
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I think one of the things the sideways reveal did, and not really addressed in the thread, was answer the cliff hanger to Season 5. Could the Losties change history? The answer was no. Time travel works just as Daniel originally explained it, whatever happened happened. As Jack says in the finale, there is no magic reset button. I think that is one of the themes of Lost.
Anyway, if you want a more literate analysis of the show (including the finale) you should really check out Jesse's column.
But, back to the original question, no the finale ruined nothing and I look forward to getting the series on Blu-Ray.