Dota 2 is shiet. No offense to people that play Dota.

i know what you can play

1.Download an arcade emulator and get any of the ol good street fighter games.

2.M.U.G.E.N Runs on any computer.

3.any of the command and conquer games.

4.toribash(duh)

5.halo

SanctuaryRPG

can't believe Rimworld only has been mentioned once, great game that I'd highly recommend (and it runs on low end pcs ofc)

Broforce
Any game by Telltale, these even run on a cellphone
GTA San Andreas, that samp is still fun to play with friends
Rayman Legends
Paladins
Team Fortress II
Dishonoured, well optimised for pc
DmC, same
Dark Souls II, same
Batman: Arkham Asylum

And try to stay away from recent open world games, they need a good computer to run in playable fps.

hyper light drifter

risk of rain

downwell

axiom verge

shovel knight

spelunky

any 2d pixel art indie game really

oh,also play bit of war and megaman x street fighter.those are two good games and can run even on a windows xp lol