I've actually been playing an iOS game, but didn't see a recent thread in the appropriate sub forum for this. I started playing Super Mario Run when it first came out but gave up after a few days, disappointed that they'd turned an excellent platformer unto a single button endless runner.
But I came back to it, and I must say that it's
really well made. It actually maintains the depth of standard Mario games; it's extremely easy to control but a challenge to play. In hindsight, I don't know why I expected anything else. Think of how many classic Mario games you played by just holding down the right directional button and pressing A whenever you needed to jump.
Not only does it play as well as other 2D Mario games, but it's also evident that the developers put a lot of thought into level layout. There are tiles that pause Mario's running, letting you time your next jump to get a combo off of an approaching enemy, there are earlier sections of levels that have you do something seemingly bizarre and contrived so that you know what to do when you encounter new mechanics at the end of the same level, and there are sort of decoy mechanics—places where it looks like you should do one thing, but if you do, it makes it impossible to get a star coin, so instead you must think of an alternate approach.
If you made the same mistake I did in thinking Mario Run was another shallow endless runner with an expensive IP attached, I'd highly recommend checking it out.