Yep, got some inspiration for it there but it doesn't really render guns useless per se. It can definitely stop bullets and other fast moving projectiles but only a handful of hits then the generator overheats and will take up to a minute or an entire hour to recharge. 

High-end shields will stop armor piercing rifle grade bullets and even large explosions and recharge after a minute while budget shields can only withstand pistol grade bullets and will not save you from explosions as well as taking up to an hour to fully recharge.

But either shield can't block slow moving projectiles. So arrows, bolts, thrown objects, melee weapons, and good ol' fisticuffs are still fair game against these high-tech shields.