You can get a chance to try out the new Doom (well, the one from 2016 but it is the newest one) to see if you like it.
If you do, you can get it for 50% off - I am not sure how good that price is as I have not checked but I thought I include this offer in this post as otherwise someone would have complained about leaving it out.
As I have not played the game myself I assume that the free time would be sufficient to play the game through in single player campaign - so if you are not in multiplayer, you can play the game for free and then be done with it.
Enjoy.
Edit: Checked the historical low which is $17.58 AUD - no idea when it was and if it will happen anytime soon again. Therefore, if you want to play soon, the 50% is not too bad I suppose.
Edit: Apparently the free play only includes the first two missions of the campaign - not sure if this is correct and was not aware of it at time of posting. If it is true, maybe then the enormous download is not worth it. Sorry if this post wasted your time.
this is currently 20$ on EB Games,
and a 65 Gig steam download,
after the 65GB it hit me with a 35 GB update. WTF?