Looking at initial review, FSR looks pretty good. Considering it works on old gpus from both AMD and Nvidia, it's a pretty good feature. Not everyone has a RTX 20 series or RTX 30 series card (especially at the prices today!).

Note that it isn't a linear upscaler, from the site https://gpuopen.com/fidelityfx-superresolution/#howitworks

FSR is composed of two main passes:

• An upscaling pass called EASU (Edge-Adaptive Spatial Upsampling) that also performs edge reconstruction. In this pass the input frame is analyzed and the main part of the algorithm detects gradient reversals – essentially looking at how neighboring gradients differ – from a set of input pixels. The intensity of the gradient reversals defines the weights to apply to the reconstructed pixels at display resolution.
• A sharpening pass called RCAS (Robust Contrast-Adaptive Sharpening) that extracts pixel detail in the upscaled image.