Despite my appreciation for their support of Linux, I would not by any means recommend Oil Rush.
The mechanics of the game are extraordinarily simple, and the control of the units so coarse that any sort of "micro" control is entirely absent. Despite this, the game manages to become quite obnoxiously difficult a few stages in -- the irritating factor being that numbers are nearly the only determinant of strength, and yet the AIs can produce units at exactly the same rate as you, and so the game quickly enters a deadlock state where you're throwing units to capture one node while the opponent simply recaptures the last one you captured, that you HAD to remove forces from in order to actually stand a chance of capturing this new one; so the game quickly devolves into an incredibly boring series of ineffective node trading.
Then, the game is barely interactive at all. The combat, as I have said, has no micro whatsoever (so you just watch as two guys on jetskis shoot SMGs at each other while circling a building), and the "macro" involves simply capturing nodes and then building several highly ineffective turrets so you can pretend they're better defended. Most of the time you're just sitting there watching, to the point where I have to wonder whether it started development as an automated Unigine demo.
The world's okay, though there is nothing particularly interesting to draw one in. The characters are forgivably cheesy and forgettably uninteresting. Overall, it's pretty forgettable, though it looks about as good as endless water and some utilitarian oil platforms can look.
Overall, it's not something I would recommend, even when compared only to other Linux games.