I started playing Civ I the first month it came out.
As far as Civ VI goes, it looks genuinely promising.
I loved Civ I and adored Civ II. Wasn't a big fan of Civ III but loved cIV. I bought Fantastic Worlds for Civ II and played SMAC and Colonization and played them all heavily. I've pretty well bought every Civ product there is until Civilization 5 came out.
Didn't care for Civilization 5 at all. I found it boring and uninspired. Civ should be a series of interesting decisions. Civilization 5 didn't have that at all. Even the expansions, although they added some interesting things such as religion being developed further, didn't address the problems with the game's core.
Thankfully, the community stepped forward and the Community Balance Patch (Vox Populi) has addressed many of the problems. Ditching global happiness was an excellent decision, for example. So, I owe the community a debt of gratitude for what they've done. I'll likely play it in the future so Civilization 5 has been redeemed for me, somewhat.
So, the community here has given me hope and seeing that Civ VI seems to be backing away from Civilization 5 somewhat is quite promising. Ditching global happiness, for example. The impression I get so far is that there are a lot more interesting decisions to be made and that has me excited.
Now, after the disastrous launch of Civilization 5 when the game clearly wasn't ready, I won't be a day 1 customer. I will wait to see what shape the game is in, let the hype die down, and wait for some honest reviews (not the rubbish that 90% of the sycophantic media puts out) to make my decision.