I've played all the older Lego games. Most of the replay value comes from Free Play where you are trying to unlock every character/vehicle/etc. Since those are all sold separately here, that will basically just leave the Gold/Red bricks and minikits. Doesn't seem quite the same IMO.
As for the minifigs themselves, I would point out that aside from a handful of new characters, the vast majority of characters in this game already exist in some other Lego set. So design-wise, they didn't have much to do.
And further, 29 of the 40 Year one characters have already been in another Lego game, so even less work needed.
As to the price of a Fun Pack - $14.99, for that same MSRP, you could buy the Lego Movie Double Decker Couch set that comes with a vehicle, the big couch, and FIVE characters. So yeah, the value doesn't really seem there to me in a straight up comparison to an existing Lego set.