It's been two years that I'm watching Lost, and I can't say I'm disappointed by the scenario (and the cliffhangers!) ^^
But I'm also watching Supernatural and Flash Forward, and those two are getting better and better too (Supernatural actually got more interesting in Season 4, so I would recommend you to watch the series from this point)
I also love South Park and Spongebob (heck yeah, I don't mind telling that!)
I used to watch lost, but after the third season (I think), when the flash backs became flash forwards, I decided to hell with this, it's too confusing. I really hate those flash backs. I'll watch supernatural if I see it on, but I dont go looking for it.
also, come on, who doesn't love spongebob,
My sister would check up on the recent Lost episodes these days and I think she get's entirely "lost" when it comes to watching the show. I've heard of Lost, but I wasn't really interested in the show when it first debut. And when the show first came out, that was the time I was in college, so I never had the chance to watch too much TV at the time. If I jumped into watching the show now, I would probably be pretty confused at this point. Usually drama shows and I don't really bond that well.
As for Spongebob, I used to hate this show so much. Then I started to like it, then hate it again because the later episodes haven't been highly hilarious like in the older seasons. It used to had a bit of that crude and immature charm like you would see in older Nick shows such as Ren and Stimpy, Rugrats or Rocko's Modern Life (although those shows were pretty or highly cruder than Spongebob). But when more episodes were being released after the Spongebob film, it started to change and I wasn't that entirely entertained by the show anymore. The most recent Nick show that I would watch these days are Penguins of Madagascar. It has some funny dialogue that I can easily laugh at. I know that I ain't the only 20 and something year old viewer that watches the show.