are you using a pc or a console? if you are using a console you are gaming at 720p or lower. if you are using a pc and set the resolution to 1080p and you dont see a difference then you need to go to specsavers.
No need for the insult. Vs.
*** Please keep personal remarks to yourself - Thank you ***
On a monitor, that is 1920x1080 native ANY resolution below it is going to look substantially worse.
TVs however, are much, much, much better at scaling. The result is 720P content can look fantastic on 1080P displays.
So yes, on a monitor the difference between 720P and 1080P is night and day. Well done.
Edit: Not sure if it's the consoles themselves that are good at scaling or the TVs but either way playing games at 1280x720 on a 1920x1080 PC monitor looks awful.