So it crashes at regular intervals. It lags occasionally when a city gets really big, aside from lagging at every autosave. The AI can be infuriating at times: If you like micromanaging, be prepared to sit back and pull your hair at your laborers who will go across the Nile and over 2 mountains to haul limestone, while an overseer stands by himself overseeing no one in a site right next to their houses. Transporting heavy loads, like statues and obelisks across the Nile is also a well known problem, annoyingly time consuming at best, unsolvable at worse (unless you're willing to delve into the editor). It shows its age in a lot of ways, the graphics included, though they still hold their own fine enough.
And now that you have all that information, just look at the time I've sunk in this game. It's just a great city builder. Flawed but great. The setting is interesting, the concepts are the same old, yet refreshingly different. It doesn't have an insane depth of strategy (it may even feel a bit simplified compared to other similar games), yet it feels satisfying. Most of the strategy involved is focused in where you build and what you prioritize, which needs to ignore and which to focus on, so really, when to build what where. There is enough you need to balance for it to stay challenging, between food cultivating, prestige maintaining, religious needs and building pyramids. There's also some nice extra bits of historical info hidden away in the interface if you want to learn something new.
The game is easy enough to pick up if you play the tutorials, which are ok: basically playable, hand-holding, mini versions of the game - I felt I was playing, not reading a tutorial. Even so, looking up some of the details on how the AI works will help you understand the mechanics better. There are huge forums with tons of info, player maps and walkthroughs available online which can help with that. Also worthy of mention, I found the interface easy to use and perfectly adequate, which I think is very very important in a city builder.
Should you buy? Yes. Provided you understand that this is a game released in 2008 that has its share of small annoyances, if you like leisurely paced city builders this is still a solid game that hits many marks.