I also looked at that monitor, and saw the Rtings review. I'll trust Rtings over the self-reassuring comments of people who already spent money on it.
Rtings breaks down exactly why they gave the monitor a poor Gaming score. To me the most glaring issue is its GtG transitions are awful, averaging 16.3ms with a max of 26.8ms. That's even slower than Dell's 60Hz displays. A good gaming IPS will be less than half of that and might get a Gaming score in the 8's. (OLEDs are <1ms for comparison and can score in the 9's.)
Disclosure edit: I also really wanted that Dell to be good so I could buy it. The spec sheet looked perfect. A shame...
Here is the original thread I mentioned in my post re: Dell U4025QW (some interesting back-and-forth discussion [all constructive, for those who worry about such things] between some commenters and a representative from RTINGS).
Also,
Here is a dedicated thread for owners of that Dell.
As someone who regularly uses an
LG CX55 (OLED), an
LG 32UD59-B (VA), and even a
Vizio M43Q6-J04 (VA) (all for work and play), I actually do (kinda) miss my older IPS monitors (from NEC) with the A-TW polarizer (but the black levels were never there, and their size is too small for my work nowadays), so the Dell is right up my alley with its size, IPS Black panel and prosumer orientation: some gaming with Adaptive Sync/Freesync @ 120hz, but primarily for work purposes. The infamous text fringing issues (subpixel structure) with OLED and (some) VA panels is also something that is difficult to overlook, even with options like ClearType, MacType Tuner, BetterClearType Tuner, etc. (latest OLED models have greatly improved, but not fully resolved, this stupid issue -- blame Microsoft). This isn't an issue with IPS Black, so I'd be very happy on that front.
For those that prioritize gaming over work (but still do a good amount of both), I'd agree that the Dell is most likely NOT the best option.
This would make for a fun "gaming-oriented" prosumer monitor; but for me, it's not big enough, has bad blacks (normal IPS), and bad local dimming (does have the A-TW polarizer & 144hz w/AMD FreeSync, 160hz w/NVIDIA G-SYNC, though).