Cities: Skylines is a modern take on the classic city simulation. With a completely new mechanics of a Tycoon type of game, it is widely considered as the best city simulator up to date. If you want to check if you can be a mayor, then this is a game for you. It is going to put your skills in test.
One of the main problems connected with most city simulators was lack of proper traffic. Yeah, there were cars, buses, trains etc. traveling through the city. However, it felt artificial. Cars did not behave like they should. However, thanks to the experience Paradox gained during the production of Cities in Motion, they were able to create realistic model of traffic. What does it mean in practice? You must take care of proper road infrastructure. Bad planning might result in traffic jams, which might damage your profits.
With the tool for modders, players can create their own maps, buildings etc. The only thing that can stop you is your own imagination. However, the best part of it is the fact that you can present your projects on the Steam workshop. Thus, other players might download it and provide you with an opinion. Who knows, maybe your project is going to be implemented as a DLC?
Perhaps the most interesting aspect of Cities: Skylines gameplay is the day and night cycle. The day cycle has a huge influence on it. During the night, the traffic is going to be much smaller. Furthermore, many of factories etc. are going to work with lower efficiency. As a mayor, you must take this aspect into consideration. After all, you want to see your city flourish, right?