It's hard to give a rating to LibreQuake, since it's very much still in progress (maybe 50% of the maps exist without placeholders, and a couple of monsters are incomplete - although actually, I find the placeholder rainbow ogres quite charming). It's also difficult to rate LibreQuake because it's trying to provide a "similar" experience to paid-for, copyrighted vanilla Quake, rather than extend the experience like most mods.
Playing on Easy, I'd say that the maps that exist tend to be slightly harder and more tricksy than those in vanilla Quake, especially getting to episode 4. (Although, of course, E4 is also pretty vindictive itself in vanilla.) There's definitely a couple of secrets that feel more "modern" than the stuff in the vanilla maps, in a good way. Of the boss sequences, I think the replacement for Cthon is much better than Cthon, so that's a point in favour!
Monsters, of course, behave essentially as in Quake, as the quakec is the same - I'm divided on their models (I have to admit to not being a massive fan of the "new" knights looking like they're from a discount bondage show, but I quite like the vore replacements), and I'm being honest when I say I actually like the placeholder rainbow ogre more than some of the finished ones - it's quirky and silly and fun.
also its a community project so there is no "his creation" in ref to the project as a whole
if you wanna use pronouns to refer to the person running this account she/it/they is fine