It's not just that they were CRTs.

You can get an excellent picture from the CRT computer monitors of the '90s and '00s, with high resolution (up to 2048×1536—better than 1080p!) and color rendering that's arguably better than modern LCDs.

CRT TVs had low resolution, and NTSC/PAL has pretty bad color fidelity as well, but one of those high-definition CRTs connected to an RGB component video input (VGA or SCART) carrying high-definition content (DVD or Blu-Ray) is another story entirely.