Wow. I can't believe nobody's said this yet.
But when I first played the game it was strikingly obvious that this game was a blend between Puerto Rico and Citadels (also Agricola, but that was already said). Due to its "pick a class every round and recieve its benefits" gameplay, this game is a remarkable resemblence to those three in how it plays out. Sure, there are some unique intricacies thrown in for good measure, but at its core this game does nothing those others haven't done (and, if I might say, mastered) before.
Though I can see some comparison to Settlers of Catan due to the "gain some amount of random resources every round for which to spend on VPs" mechanic, I am shocked by the comparisons to Ticket to Ride. How is it similar to Ticket to Ride exactly? I see nothing but extreme abstractions in their similarities.
Being the main game designer, I would suppose my word counts on this subject.
I never meant Kingsburg is similar to TtR in mechanics, it's similar in weight. I trust you to understand the difference.
I can somehow see, and I am kinda honored by, the comparison to Citadels (an absolute masterpiece that I love). It will likely even become greater with the expansion, where you do really pick a role.
If we are talking about game mechanics, Kgsbrg has several similarities with a card game (being Citadels, after all, a card game): you are dealt a hand of cards - in this case dice rolls - and you have to get the best out of it.
But the comparison with Puerto Rico (not that I haven't read this before) always lets me kinda stunned. Ok, both games have buildings with different powers. So, what? They may appear similar to a first "neglectful" glance, since in both there are buildings with different costs and powers. But even my old PC Warcraft videogame had "buildings with different costs and powers". My old Amiga Civilization videogame had that, not to mention Master of Magic. It's a fairly common idea. And those two last videogames are much more similar to Kingsburg (well, Kingsburg is similar to them) than PR. Otherwise, we would have to say that Carcassonne is similar to Tigris & Euphratis, since in both games you draw tiles and place them close to each other, etc...