It really depends on your expectations. LOST is very character focused and the ending was to give closure to the characters, and it did fine in that aspect.
But LOST also had a lot of world building and mysteries that were ultimately not really explained in the end and the writers basically admitted that they were making it up as the went along and didn't have a plan with what to do the shit-show they set up.
If you go in with the expectations that you're not going to get every little loose end tied up in that aspect, it's pretty kino. I plan on rewatching the entire thing again soon.