Not at all. What’s important to remember is the Droids outnumbered the Clones 100-1. That’s an insane ratio. Imagine a medieval knight, decked out in all armor on horseback, against 100 spear-armed peasants. That’s basically the quality gap from Clone to Droid. It is the reason whenever we see them, they are almost always killing tons of battle droids. Eventually, though, one battle droid is lucky enough to shoot one down, and the war stays even.

There are two reasons the Republic did not raise an army:

The Clone War is imperialistic by nature. The CIS is fighting for their freedom, so it makes some sense why they’d get a militia (see: Geonosis, Umbara). But the Republic is fighting to keep its government together. A war would easily backfire should actual citizens start dying in combat. Senators would question the violence and possibly depose Palpatine, who was adamant in the war’s continuation. But Clones are viewed as second class citizens, so no one really cares. Plus the Republic can continue on economically.
Clones are stronger. They come from Jango Fett’s DNA, so they are better than the average soldier. Continuing on our metaphor, imagine the clones to be a knight, droids peasants, and the average person a medieval soldier/archer - at least they know how to fight, but if they go against the best, game over. So not only does it help the Republic stay together internally, it contributes to their chances of victory.