grandmaster
Veteran
I think "cripple" and "decimate" are a bit strong for 30fps - it's still perfectly playable and more than enough for the Lego games (and pretty much any other game apart from racing games/beat 'em ups IMO).
On the contrary, I think LEGO Indiana Jones is a perfect example of just how much better 60fps looks, and the v-sync mode looks and feels like a substantial step down, even factoring in the often awful screen tear.