Worst of all: from the video it appears there is literally zero innovation in the gameplay, its just adhd shooting and running with the same futuristic weapons all over again.
How exactly do you innovate a competitive first person shooter? Give it some weird play mechanic which never ends up being fun at all? Give it realistic weapons and a reload button? Come up with some uber-complicated gametype that nobody will play anyway because it's too complicated and doesn't play well? Add vehicles and turn it into a bad version of Battlefield 1942 instead of a bad version of Quake?
I like simple first person shooters. Years later, I'm still waiting for something to out-Doom Doom 2 or out-quake Quake 3 Arena/Quake Live. That said, Nexuiz isn't a bad game because it doesn't innovate, it's a bad game because it falls into the trap most simple first person shooters fall into, in that instead of refining their core gameplay into something simple, fun, balanced and deep, they just throw a bunch of random content into a box and hope some of it sticks without caring about how it'll play long term.
It's not just the open source projects doing this either, look at how many people are still playing Unreal Tournament 99 and take a look at what they're actually playing (usually autosniper FFA or instagib CTF). Compare this and the number of people still playing the dozens of unforgettable quake clones that came out in the late 90's to the number of people playing Quake 3 Arena in one of it's various incarnations (Original game and Quake Live).
Nexuiz might have enough content for a game, but in terms of gameplay it's not even close to out Quakeing Quake. And that's why it's not noteworthy, not because it's "not innovative", whatever the fuck that's supposed to mean in this context.