AusGamers has reviewed Civilization V and writes:
"Another major area that has changed is in customisation, as in, there’s very little. In the past you could actually name each of your cities and forge your own customised civilisation with an amalgam of perks, abilities and bonuses from various other civilisations. Now, however, you’re locked into choosing a pre-existing civ but it’s not at all a bad thing. Each one comes with a specific set of bonuses based around their real-world cultural impact so, Japan for example, can make Samurai units who will attack as if they’re at full health regardless of their HP. While Siam can generate powerful Elephant units to trample cities. There are varying degrees of bonuses based on your civilisation of choice making for a heady amount of replayability within the game’s complex make-up."