Without mods it's pretty good but maybe not the best
WITH mods... it is hands down the best city builder ever made. But you best have a beefy computer because this game will quickly eat all of your VRAM and even more quickly devour your RAM. But with the mods that most of us play with the level of detail is just unparalleled, so drop some money on an upgrade if you have to.
Huge Kudos to Paradox for how they handle this game. *Some* companies may see a bunch of mods as a "threat" to their income stream from DLCs. Paradox on the other hand made their game easily extensible and straight up encourages modding. But everyone still buys the major DLCs because they're actually good and add to the game.
And I would like to extend my thanks to all the Cities:Skylines modders. Ya'll have done amazing work, and all of it essentially for free, you legends.

Without mods it's pretty good but maybe not the best WITH mods... it is hands down the best city builder ever made. But you best have a beefy computer because this game will quickly eat all of your VRAM and even more quickly devour your RAM. But with the mods that most of us play with the level of detail is just unparalleled, so drop some money on an upgrade if you have to. Huge Kudos to Paradox for how they handle this game. *Some* companies may see a bunch of mods as a "threat" to their income stream from DLCs. Paradox on the other hand made their game easily extensible and straight up encourages modding. But everyone still buys the major DLCs because they're actually good and add to the game. And I would like to extend my thanks to all the Cities:Skylines modders. Ya'll have done amazing work, and all of it essentially for free, you legends.