If you log into this site you can compare your machine specs to those needed to play the games you have listed. On a brief look I can see no problem with the machine you have specified for those games. It will not play the latest fastest games but it is a fair basic machine. As for Cougar, you can search this site for comments about them, but most I have seen have been positive and they have been recommended by several members.
OnePlus 5 review