I’ve been playing it sporadically over the past 10 years and I’d say it’s a lot of fun! Very easy to get into, even for people with little strategy experience. The mechanics are clear and not overly complex; for beginners and intermediate players I feel like it’s just the right balance.
It also runs on pretty much anything (as demonstrated^), so I like having it installed and playing a short skirmish for 20-30’ if I’m bored. Alternatively, there’s plenty of decent campaigns, and a lot of fan content (and a map editor if you want to try your hands at it).
I’ve only played it a computer though, so not sure how well the interface works for touchscreens.
I’m surprised that the effect of major rivers is big enough to be visible on a global map, at least in otherwise saline areas (Amazon, Mississippi, Congo?). Interestingly, the world’s longest river (Nile) which drains into one of the saltiest seas (Mediterranean) doesn’t register on this scale at all.