re: how mod-friendly Doom was, Portal 2's simplified level editor (released 2012, after this was written) was pretty well-done--only exposed a tiny fraction of the things one could do, of course, but enough to build real puzzles, and with just enough default visual interest that the product didn't necessarily look awful.
Of the user-made levels, it's surprising how many used the full level editor anyway--even though, as the post notes, building levels ain't quite as simple as it was in the Doom days. User-made level gallery:
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re: how mod-friendly Doom was, Portal 2's simplified level editor (released 2012, after this was written) was pretty well-done--only exposed a tiny fraction of the things one could do, of course, but enough to build real puzzles, and with just enough default visual interest that the product didn't necessarily look awful.
http://theportalwiki.com/wiki/Puzzle_Creator
Of the user-made levels, it's surprising how many used the full level editor anyway--even though, as the post notes, building levels ain't quite as simple as it was in the Doom days. User-made level gallery:
http://steamcommunity.com/workshop/browse?appid=620&browseso...
Not entirely surprising; there was already a gigantic Source modding community well before Portal 2.