Yeah I tried it out in Metro 2033 and Last Light Redux, both the official implementations as well as through Reshade and it honestly just didn't do a whole lot. Sure it gave it a little bit of enhancement but nothing that WOW'ed me like I've seen...
All I can judge it on is what I see in front of me. If it looks better than the original, I'll use it. Unreal is not something I would base a comparison on though. Still a stuttering mess. Always will be.
I've gotta say I was very skeptical of the neural rendering stuff. But, as with anything PC, I messed around with it in various games and gave it a go. Have to say, in Cyberpunk, it was worth it, so much so I'm replaying it after 2 years...