I haven't played Dungeon Keeper Mobile, and I doubt I ever will. I haven't played a lot of these "free to play" games. If I have free time with nothing but my phone, I'll generally read something on it instead. But then these games aren't for me.
Jim Sterling, in the video, complained about how little there was to do in Dungeon Keeper Mobile. You'd start the game, click a couple times to place down a few blocks or dig or put things down, and that was it; you'd have to wait a couple hours for that task to complete before you could do anything else. That was the "gameplay." Sterling focused on the fact that the game would harangue you to pay some real money to speed up the process. It's a game that seems built primarily to make money off the weak-willed, by making the waits agonizingly long. It's temporarily holding your gameplay hostage, for money.
And I'm going to try to defend them.