Sorry for lateness of my impressions.
If you are a HUGE. I mean HUGE lost fan, this game is worth a $5 rental. Anything more than that is really pushing it. It had some neat lost stuff in there (ending was good, tied in with an episode 2 weeks ago) but overall it was just bad.
Voice acting was just some of the worst I've ever heard. They got a few real actors for voices (Ben, Claire, Desmond) but they had maybe a total of 1 and a half mins of talking. So it was great to hear decent voices but wham that was over.
Gameplay was bad. Just bad. The story jumped around and didn't follow the show that well (Since when do the Others have tree-forts and shoot at you in the jungle, on the 2nd day you are on the island no less? And yell "There he is!").
Graphics are decent at time. The best part of the game was when you had to run through the jungle and dodge trees and rocks. Yeah, that's saying much.
Overall, if you are a huge Lost nerd, and when the season ends in 9 days and need a lost fix, a rental is fine. Everyone else stay away.