Civ 6, as with any new mainline civ title brings in a whole heap of twists to the game's mechanics. Most of these new twists seem to directly or indirectly address some major gripes about Civ 5. Wanted unit stacking back? You got it. Want scouts to have an upgrade later game? Yup. Wanted an espionage system that's not just tacked on? You get the point.

If you're coming in from 5, you'll have a lot of moments of "oh thank god" and all in all it's a much stronger release than I was expecting for a base Civ title (To be fair, I am still backpedeling from Beyond Earth). You'll want to play this game for all of the same reasons that you kept coming back to Civ 5, and you even have a few new layers of gameplay to enjoy.

The big question though is whether the jump from 5 to 6 is worth the current price. My short answer is yes. Long answer is that 6, as expected, suffers from lack of content compared to 5. You'll burn through all of the 'newness' after 3 full games tops. However that's the only real complaint I have and it's mitigated by how many slots of new content modders can throw out. Between allowing multiple leaders for the same civ (and same civ bonus), the really specific effects of wonders, huge possibiliy for new district buildings and much more, I expect the steam workshop to be bombarded by awesome tweaks constantly between now and the first DLC.

tl;dr It's a strong foundation that has a whole lot of promise. If you're looking for a change of pace from Civ 5, go for it. But of you're looking for the best time-killer stick with Civ 5+DLC for now.