Memes always exaggerate everything to the most oversimplified extreme, and that is worth pointing out. Stormtroopers were only ever threatening in overwhelming numbers, but the heroes still had to pay attention when stormtroopers were shooting at them. They had to halt progress to take cover and stuff. Plus, the no-name Rebel soldiers on the Tantive IV were even worse shots. We see four or five Rebels go down in that fight, and I think one stormtrooper, this despite the fact that the stormtroopers were coming in through a chokepoint, had minimal cover, and their armor is consistently ineffective against direct hits from blasters, so that certainly isn't what's saving them.