Mods that are better than the base game -

HeyYou

YOU BETTER RUN!
True & Honest Fan
kiwifarms.net
Europa Barbarorum for Rome 1 and then Divide et Impera for Rome 2. Vanilla Rome 2's improved a lot, though. Pretty much any mod for Vicky 2, as well.

More controversially, I think Black Mesa has evolved to be more fun to play than Half Life 1. It is extremely hard to go back after the new Xen levels.
 

Really makes you thunk

I mostly just lurk.
True & Honest Fan
kiwifarms.net
I think Enderal is an objectively better game than vanilla Skyrim, even if the latter has way more content (but it's a mod vs a AAA game, so that can be excused, and quality > quantity anyway, right?)
I admittedly haven't played Nehrim, but I assume it's in the same boat, but with Oblivion.
 

Maskull

Your an ignorant idiot.
True & Honest Fan
kiwifarms.net
Even in its early state I would argue that Tamriel Rebuilt is the definitive Morrowind experience.
 

Friend computer

Good day citizen, what can I help you with?
kiwifarms.net
Even though i loved the base game Europe in ruins for Company of heroes 1, got me playing a couple of months extra, together with my mates, though it started to become pretty elitist in the end that i was involved with it, and certain people were blacklisted and clicks had formed which pretty much only played together, which didn't help the small community to grow, and new users to join.
 

Marco Fucko

I fantasized about this back in Chicago
True & Honest Fan
kiwifarms.net
Movie Battles is a multiplayer mod for Jedi Academy that not only adds maps and characters from all movies + popular EU content but also refines the saber combat away from something you had to learn glitches for to something resembling a directionally sensitive dueling system.

Still active even after all these years:
 

Easterling

Peak sexual performance
kiwifarms.net
"Perisno" for mount and blade warband, It's one of the biggest and most well made mods I ever played for that game.
 
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