I've been testing GeForce Now Beta for a little over a month now, and overall, it works pretty great. Most games run at a locked 60fps at Max Settings, although some require a bit of tweaking to reach that, which is expected of an RTX 3060.
However, one caveat I've noticed is that certain games run poorly regardless of how much tweaking I do. I went to YouTube to check out some benchmarks and saw that my GeForce Now FPS was considerably lower than what was shown in those benchmarks. Although the overlay always indicates an RTX 3060, the actual FPS I'm getting is that of a much slower performing graphics card.
The worst performing games I've seen so far from the few games I've tested are Immortals Fenyx Rising and Fortnite, both averaging between 30-40 FPS at Max Settings, which is unreasonably low for an RTX 3060 and more comparable to the performance of a GTX 1060. Surprisingly, the Fortnite clone Farlight 84 runs incredibly well in comparison. Running at a capped 240 FPS at all times even with the highest settings (that doesn't require a restart). Despite having to set Fortnite's settings at the lowest possible settings and run it at 50% resolution scale (540p) only for it to peak at around 150 FPS is just pathetic.
The performance in games seems vary considerably from one game to another, ranging between a GTX 1060 and an RTX 3060. This means you could get something like an RTX 2060, or a GTX 1660, so it's just not consistent in what graphics card you could get, Here's an Album showing the performance of some of the games I've tested: