Serious question, multifaceted answer, if you'll excuse the geometric pun. At a quandary, basically.
I like the UT4 Alpha, but find it hard to justify expenditure of time on a game which so few people play and therefore is difficult to get feedback for.
CS:GO/SDK is interesting, has lots of players, but lacks scope environmentally and feels constrained.
TF2/SDK is kinda the same, but with lots more flair - but is ageing now, and like CS:GO, feels constrained and restrictive, or perhaps a little too well-trodden?
So, looking for something which allows me to map. Something which no one is making maps for now, but has a big and active community for, yet is not so old that the game mechanics have worn holes in the carpets for routes which everyone takes, as part of the game mechanics. I'm also looking for something which is not going to be replaced (tech-wise) soon.
Ideas? Opinions? Thoughts? Beliefs?