For some reason, this interesting strategy game on iOS didn't display ads properly at first, when I got it. The IAP to get rid of them was there, but I never saw any. Maybe if I had, it would've gotten a 3/5, depending on how frequent they would have been. But I still say it's an interesting game because grid-based strategy products aren't that abundant on iOS - even if the platform should suit them well - and the team building with new units you unlock after completing certain missions is a pretty good drive to keep playing.
Civilization 5 was a masterpiece of sorts and Beyond Earth iterates upon the concepts brought to Civ5, adding a few things that are quite interesting and still creating the perfect 'one more turn' experience. You have more control on the direction your civilization is taking with some more customization features that impact gameplay in semi-significant ways and you have about half a dozen ways to victory. It's one of the rare games where I just started playing and emerged from a 8 hour session, only after victory was within my grasp. This was on very easy, but oh well.