Honestly, I hate the CRT aesthetic. I grew up with CRTs. Leaving them behind for LCDs was one of the greatest transitions of growing up. By all means, enjoy them if you do, but I don't.
It's not just the look of it, but the art and games were designed with the limitations of CRT in mind. Not all games off course. An example is the transparency effect on Genesis / Mega Drive:
Thanks. I shall avoid the motion blur variant as best as I can, because that's one of several aspects of this device I do not remember fondly.
I borrowed a friend's Game Boy for an afternoon when I was a kid and I was so disappointed by it (primarily the screen, but also poor ergonomics and the limited nature of its games) that I lost nearly all interest in gaming for a year.
Getting the settings right for video is critically important, too. Scaling needs to be done with the nearest neighbor pixel method, not more modern blend methods.