Victoria II released in a messy situation, bugs were all over the place and the game was and still kind of rough around the edges.
Thanks to community mods, patches and long terms support the game got a lot of improvements and can be now enjoyed for the deep strategy game it is.
Victoria II is a grand strategy game focused on Economical and Social management, and its the king in that aspect.
The depth this game offers in unparalleled, it claims the throne among Paradox games as the deepest and hardest strategy game to master, the learning curve is very demanding but the rewards are worth it.