I'm primarily interested in Single Player mods such as new Campaign maps or various other gameplay tweaks and addons.
I'm also a huge fan of the Aliens, Predator and even Terminator franchises and will always be on the lookout for Mods that are relevant to those themes.
The reasons why I don't play multiplayer is because I grew so disappointed and frustrated with the lack of officially support Co-Op modes such as Campaigns that work fully with Co-Op multiplayer. Unlike how back in the early days of Classic Doom and Duke Nukem 3D as I really missed how back in those days, Co-Op is 100% Fully Compatible with the entire campaigns' maps WITHOUT any issues. Nowadays, you're lucky if Mods to create a Co-Op experience even exist for the game you want to play.
I just became so fed up with the current industry, as they rarely ever cater to those that enjoy good full co-op campaigns so I called it quits entirely for Multiplayer, in particular to all the competitive Deathmatch gameplay modes.