Critical miss just means you rolled a 1 on your d20, and doesn't have any other consequence. It's just to let you know that you rolled a 1 and would miss regardless of AC or hit bonus.
Makes sense, I'm totally fine if that's how it works. But I think it should be better communicated to the player. Critical hits have a unique animation and you can tell you're hitting hard. Right now it doesn't matter to the player if it's a miss or a critical miss. The outcome is identical. I would like to see it feel/look different, like add a special miss animation where the attacker is extra clumsy so even if the outcome is mechanically identical, there would be a perceivable difference other than text. To add to this, some people have suggested showing the rolls of the attacks on screen similarly to the damage/miss texts could help.
Similarly, it looks weird when misses, even critical misses visually hit but it just says miss. This is particularly true for projectiles and spells that leave surface effects. They still land. A miss should make the projectile go elsewhere.
This all also relates to the AC vs HP debate and how animations, sounds and seeing the rolls could make missing attacks a better experience than it currently is.