Attempting to play Zodiac, apparently one of the best-regarded Deus Ex mods, which is to say it's one of the half-dozen that amounts to more than "here's a demo level! then everyone disbanded/lost interest forever".
I say "attempting" because it's, ah...Not That Good. Visibly janky level geometry in places; obviously aiming for Realism In Level Design and just landing in the awkward zone of everything being tediously big to run around and too empty of things to do. "The real world, it turns out, makes for a shit video game" is literally one of the things the DX team cite as lessons learned from making it; mod authors are real bad at learning that one.
I keep looking at it and going "but you could have made this better by scaling this empty space down to two-thirds the size, half even, breaking it up with some ground clutter, put in some little quasi-secret side areas to give a sense of accomplishment for finding" or "ooh, you can get out onto a little realistic architectural ledge there! And the actual game would have put something right at the far end, an energy cell or something, to go Well Done, You Sure Exhaustively Explored That! but this mod doesn't believe in that."
This mod also doesn't believe in hacking. Lots of computers and the game's other computerlike devices; none so far are hackable. That's just annoying; I can't think of a single time the vanilla game pulls that shit, even if the level design tools support disabling it — not even on friendly computers, belonging to the POV character, which they have the login for. (Incidentally, the way that Deus Ex computers are all utterly lonely little silos which seem to have no meaningful networking but nonetheless are primarily for receiving email never stops being hilarious.) Which, ugh, really makes me really hate the clumsy UX around ooh, here's a keypad, I think it's one I discovered the code for earlier, let me...uh, let me back out of the keypad UI, open the inventory, select the "information I discovered earlier" tab, scroll...skim all these blocks of tiny text...oh, there. Now to memorise this 4–5 digit number for the length of time it takes to back out to the main game, open the keypad UI again, and enter the code. Um. What was it? Maybe I should get a pencil and some post-its....
(Which is to say, were I going to mod Deus Ex, I'd really want a "overhauled Keypad UI, ft. all the keypad codes discovered in this level" feature, way before I'd consider custom guns.)