I guess the main reason why nobody is talking about it is because there are too little details available in public to talk about. Their website is little more than a mere landing page, there's no Wikipedia article, and even reddit discussions do not answer the simple question of what makes it better than Q3A/QL/Q2/QW/Warsow, you name it. Just like no one is talking about Reborn I guess...
One can get some clues here, e.g. about what maps are cooking up so far, but that's about it. Personally I'm totally happy with Q2 in terms of the atmosphere, physics, weapon balance, and overall gameplay, then there's VQ3/CPMA for more demanding players which arguably is even closer to a perfect FPS than Q2, QW for those old die-hards of classic rockets and shaft, and there's QL for casual gamers who want FPS with modern features like matchmaking, more or less large community, and other social buzz. Sadly enough, Quake Live is becoming less of a classic FPS since recently, as it had been almost killed as we know it, to an extent of being currently on a life support. :-(
I bought in on steam and gave both the game and the editor a try, but atm it feels like cpm without textures and bots to me. Don't get me wrong, CPM is great and I love it. But it is also dead, because only very few people play games like that nowadays.
Same applies to reflex. There are only very few people playing it, and you have to find the busy servers by irc, and all that. This is fine for all the hardcore players out there, but I think for most people it is just to hard to get into the game. Quake Live has some great maps, a matchmaking system, 1-click-join, and more great features. It makes it way easier for new players to join, and still the servers are almost empty now. I do not see who should play reflex over QL, apart from the few hardcore cpm people. And whether reflex will be able to survive only with them, I dont know. I really would like to see another successful CPM, and I hope that reflex will become something great. But I gotta say I doubt it. I see no reason why it should.
Looks like they settled for a steampunk theme for Reflex -> www.reflexfps.net/forums/index.php?/topic/2407-new-weapon-concepts/ <- But yeah the game is already dead or never was alive in the first place :/ I like the feeling of the game though, I played some duels with my friend in even earlier stages than this and we had a blast. Even cooked our own map over the weekend which was a really fun experience doing it in-game like that, and with a friend.
I tried to play some QL yesterday (a sunday afternoon, during Quakecon, which should inspire some ppl to play) and it was impossible to find a proper CTF game in my area, which isn't that sparsely populated (Frankfurt, central Germany). On the only server at least a few people on, players were insulting each other and starting votes for other maps every second instead of readying up -- for more than 5 minutes, then I disconnected. I think the classic FPS games are dead.
Seems it's already dead: steamcharts.com/app/324810 Average player count over last 30 Days was 4.3 (worldwide). And no, that's NOT 4.3K. The 24-hour peak was 10 players worldwide today. EDIT: It seems it's not officially released yet, and they do only intend to advertise the game when it it release, so this could change in the future. I bought it and gave it a try, the game does not look bad at all. I think Unreal players are gonna like the movement system way more than Quake players though (reasons: dashing by double-tapping movement keys, no rocket-jumps [deal tons of self-damage and do not take you very high], no strafe-jumping, elevator-jumps, wall-jumps by dashing). Game looks ace, the maps are very beautiful -- almost a bit visually distracting.
I played some Reflex during the last days. It's uglier than CPM but just as much fun. It's hard to find a TDM or clan arena ('atdm') game during most of the day though. In the evenings it's OK. At every time of day, there are some 1vs1 servers where people are playing or waiting for a second player to join, but I don't play enough games to play 1vs1 against these kind of people, I gotta admit.
I haven't tried it, but watched a bunch of games from the past QuakeCon. It generally left me favourable impression despite all the circulated controversy on sites like ESReality; QC is still a Quake. The idea with heroes with different abilities, picks thereof, five-minute games, etc. seems to work out.
I liked that QC managed to jeopardise the world's players top: old stars no longer dominate by default, but must adjust their playing styles and learn again in order to win (at the same time not being thrown way too back down the ladder like in OW, a Quake is still a Quake). It was nice to see many old names in the lineup.
Some of the new maps are also nice; particularly, I'd like to port Corrupted Keep to Q2 after we know how to extract map geometry out of those *.pak files and their contents.