I like that it's borrowed what I think is the best thing about Dominion, the fact that every game is different. It would be interesting working out how all the different Kingdom Builder cards interact with each other.
At this stage I'm not sure if games will be more or less varied than in Dominion. The Dominion base game has (25 choose 10) = 3,268,760 combinations, while this has a measly (10 choose 3) = 120. But possibly using a much smaller subset of the overall cards will mean that any two games are likely to be more different than any two Dominion base games.
On the other hand, maybe there are sets of two cards that will make the third irrelevant. Knights + Discoverers = make lots of horizontal lines. Citizens + Lords = build big in one place. Hermits + Discoverers = build in lots of different places.
Of course, I know next to nothing about the game at this point, but having thought about it I now want to give it a go.