An amazing reality time machine that takes you to random time in the future. You'll start the game setting up a turn-limit to play for 2 hr, but it ends up to be one full weekend and you are 1 hour late for Monday work.
The original Civ 5 is already quite different from previous generations. I considered Civilization 3 to be the start of modern day Civilization series, Civ 4 to be an upgrade with trial-n-error ideas, and Civ 5 original with totally reworked graphic, animation, and even more ideas.
In its original version, Civ 5 provided many new ideas appeared on this series for the first time, such as city-states, policies, and so on. However, the new ideas come with some flaws, such as the AI, the interface, and simplicity of the new policy or other systems. Still, these new ideas make Civ 5 into a revolutionary version of the entire series.
With the implement of two DLC, G&Ks and BNW, the new ideas in Civ 5 expand to a new level for players. Diverse policies, ideologies, leaders, religions, and city-state quests. It looks more complicated, but players will enjoy it even more.
For beginners, the complexity is usually the problem to start with, however with all the instructions, tutorials, suggestion tabs from in-game advisors, and the easy pop-up instructions on every command, make it easy to learn even for a complete newbie. I still remembered how I start as a newbie in Civ3, I just start a random game. You can still do the same on Civ5 without much trouble, as long as you are patient to read the instructions and suggestions.
The game requires player to think in a broad picture.
With all these cons, there are still things to be improved. The AI is always not real enough, from Civ3 to Civ5, but it is always improving. Your computer opponents still act strangely in common diplomatic or world politic sense. The city-state AI is a bit simple, the quests they provided are also a bit too simple and too repetitive. But with the tremendous complicated game, some simplicity will be relaxing for players I think.
In the end, I highly recommend this game, as I always do to Civ 4 and Civ 3. The CIV developers do a great job to bring innovation and improvement to all dedicated players. Join us, to travel another 5000 years in game, and waste another 2 years of real life in playing it until realizing Civ 6 is coming out.