There is a reason that no army has ever marched a line of soldiers with tiny bucklers against ranged enemies. It's not supposed to work that way. It's a small but durable shield that is used for reactively deflecting blows, not catching any ranged fire aimed at you.
They are great if you go for a high agility build with 6 or more shield skill. An heirloomed buckler with high shield skill is durable enough to last you through a round of combat. But look at the fucking thing, do you really expect it to block ranged as well as a heater, kite shield, or board shield? It's tiny, how the hell is it supposed to catch arrows aimed anywhere but your arm and chest?
As far as it being 0 slots, within the crpg metagame it lets you do a few niche things that no other shield can. Aside from ranged getting a wep and shield under 4 slots, you can also carry a buckler and sidearm as a pikeman. You can spawn with a weapon, buckler, and siege shield or spikes. Maps with chokepoints for cav are worth using spikes on. Open maps with no cover are worth using the siege shield. You can give your ranged a huge advantage by providing cover without forcing a shielder to stand guard over the ranged player.
These screenshots are from before the shield skill was reworked (there is less forcefield now), but high shield skill will still let you do really goofy physics-defying things like:
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loginThis one is really funny. My buckler outlasted a horse archer's entire quiver of arrows
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loginNote the fact that my shield isn't even damaged.
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loginAll four of these arrows hit my buckler, not me.
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loginIn conclusion, buckler is fine and if you pump your shield skill a little more it will do the magic kung-fu bullet-magnet magic bullshit that you want it to do. It doesn't need a buff, it's really good.