EDIT 3: Changed the original post a bit after some discussion:
Simple opinion: The "show modded games" filter should be changed to "Show unranked mods". I feel this would be more useful as it would still filter out the games hosting 40+ sim mods, while still allowing ranked mods to be displayed.
Reasoning: Right now it's pretty much impossible to get a modded game going even with a ranked mod that changes only visuals, because nobody has the "show modded games" filter ticked. This is completely understandable, as I myself like to filter out the games that run a massive amount of random mods. But, I feel a "Show unranked mods" filter is better for the reasons stated above. By what people tell me, most use it to filter out these massively modded games, while not necessarily wanting to filter out the few ranked mods that exist. However, with the current filter, that is a side-effect that happens.
By changing it into a "Show unranked mods" filter, the functionality of filtering out overly-modded games is still there, but with the added benefit of allowing ranked mods to get more exposure.
There's also potentially more incentive for mod creators to make their mods as good as possible in order to get them ranked, which is a very difficult thing to do. Due to this, there's no fear of having modded games outnumber the non modded ones.
Thoughts?
Also, with the current filter, the "game modes", so FAF, FAF beta, Phantom etc, are not counted as mods, and therefore still show up with "Filter modded games", so it's not like it's a strictly "show default FAF" filter to begin with.
EDIT: Regarding deliberately unranked games, hosted with default FAF or ranked mods, see post #3
EDIT 2: TL;DR: Change "Show modded games" to "Show unranked mods" filter to allow for better exposure of ranked mods, without cluttering game browser with overly modded games.