Spintires: MudRunner does an excellent job of simulating mud and water but feels very much like a tech demo looking for a game. There's fun to be had in its vast muddy expanses, but it requires a little bit of creativity to find it.
It helps to remember that MudRunner is a simulation and not an arcade game. Forget for a moment that the main aim of it is to deliver logs. That's fine for a time, and you'll need to come back to it in order to unlock more levels and vehicles, but the real point of this game is driving off road.
I'd previously scrawled some hasty thoughts about Batman Arkham Knight in a vague effort to document whether I'm getting too old for this sort of thing. Join me for part two, after I've played the game for another few hours.