I've never played 1 2 or 3 so I can't really answer I guess. Civ4 was my first civ, awesome game that sparked my love for the series. But way too many units and late game was somewhat tedious and I rarely finished games. Civ5 was lackluster at launch but after BNW it was an amazing game that was engaging from start to finish. Loved 1upt but would have worked better with fewer units like civ6. I'm pretty certain I'll never play any game as much as I've played this one. Civ6 was a really solid game from the get go. But like civ4 there is IMO an unfun tedium over certain aspects. Again I'm struggling with finishing games. The DLCs didn't really address the areas I found lacking. I'm still hoping I can get back into it at some point but IDK.