Lost was a great series. With a lot of mysteries, sci-fi, plot twists and character dialogues. When Fringe came out many Lost fans took a look at it since it was an JJ Abrams show. Some loved it, others didn't. Personally, I thought it was good but nowhere near as good as Lost (especially the first 2 seasons of Lost) but more importantly it was completely different from Lost.
But, but now in, it's third season Fox is allowing the producers of Fringe to do the show they always wanted to do (they said so in interviews). Fringe is now much more serialized than before with continuous plots and character arcs. Those writers (from Lost) have a gift for great dialogues and plot twists which is, I think, what made Lost so good and it's now part of Fringe.
The scores is also very similar to Lost for those who are interested.
I've truly became a Fringe fans in it's third season, and I think many Lost fans will love it now and watching it may help you with your Lost withdrawal.