For a person with a 1080p monitor who'm is thinking about upgrading to a 1440p it's a quick and easy way to see if your current hardware is up to the task. Better to find out before the $'s are spent than afterwards.
Or a good way to see if you can notice an image quality boost or care.
No, it's not native 1440p, but if you like the IQ boost, you'll like it more native probably.
Or it doesn't mean much to you at all, and you know you don't need more expensive GPUs.
We need more Nvidia user results, but Nvidia was FIRST with DSR. It's actually a greate plan actually. You have a GTX 960, you use DSR, your GPU can't handle it, but it looks so good... so you upgrade to a GTX 970, or upgrade to Pascal, or whatever.
In fact, I used VSR on my HD7950 1440p. Then, Witcher 2 couldn't handle it well. It was ok, but I mean, come on... and Batman also ok at 1440p, but not perfect and hey... what about 1800p VSR since 1440p looked so good already....
Upgraded to the R9 290.
And with Nvidia DSR's wide options and wider support than VSR, it's weird to me that it's used LESS than AMD VSR.
The only thing I can think of is Nvidia scales worse with resolution, but honestly, that's just a benchmark number. If I swapped my system for a GTX 970, I don't think I'd drop to 1080p. I'd still play at 1440p DSR.