Thanks NIghtHawkRMX, hanotaink
Actually he is interested in particularly those games which have dedicated servers that can be hosted for LAN parties with genres like Multiplayer with Deathmatches, Cooperative like L4D2, FPS.
He had in mind games like BlackOps3, Call of Duty Advance Warfare etc but Activision has switched over from PC gaming to Console gaming and therefore has removed dedicated servers all together. Valve on the other hand still has dedicated servers for games like CSS, HL2DM, L4D2 etc but these have gone too old now.
Matchmaking kinda sucks if the game connects you to a far away location resulting in lags/rubberbanding and all.
He already has a running gaming parlor with the above said games in addition to MW2, MW3, Crysis, BattleField Bad company, Killing Floor, Unreal Tournament and likes for the past 5+ years but wants to upgrade his PCs along with getting new latest games with Dedis in mind and of course Serious Gaming; unlike games like Fortnite, PUBG etc.