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It’s a good option to increase fps particularly with the ultra quality and quality settings but I wouldn’t say it increases detail, the image is generally a bit softer than native. It can also introduce artifacts not present in the native image like shimmering and ghosting.I am a bit out of the loop with FSR 2.1. Is this worth enabling on an older system to boost FPS and detail?
I am currently using my old trusty i5 2500k with an RX580 8GB. 1080p and preset of Ultra and getting a constant 50-60 fps. Only play on Ashika though which probably helps.
If you want higher frames I’d recommend dropping a few settings down from ultra to high or normal/medium. Neoseeker has a good guide showing which settings affect performance the most. https://www.neoseeker.com/call-of-duty-modern-warfare-ii-2022/Graphics_and_Performance_Guide