I got my ODST for 9.99 new =) So it was an AWESOME deal for me.
That said, it's still a great game. I got through SP the first time in about 3.5 hours (with a friend, normal mode, I literally ran the whole time, rarely took cover, just to get through it with him quickly). At the fastest, I could probably do it in 3 hours, but that's like playing Uncharted on Easy and running through it. It might take 8 hours total due to those "incredibly tricky puzzles" but that's the only reason that it would take so long.
Playing at your personal difficulty level should probably take you about 6-9 hours for ODST, decent length for a SP campaign. Then there's firefight which is awesome. And free maps if you didn't get them in H3. And Reach beta. Easily worth 40-60 if you like the game.
This goes for any game, but if you don't like it, it's probably not even worth $10 to you. So saying "I don't like it, so it's not worth $60" is kind of moot and biased.










