And Saruman creates thousands of them.
After half a film's worth of buildup, we finally see the Uruk-hai in action at the end of Fellowship of the Ring. They pursue the fellowship and manage to kill Boromir.
You know, the guy who got his ass handed to him by two unarmed hobbits.
Well, eventually. Boromir, with multiple arrows piercing his internal organs, manages to kill half a dozen or so of the Uruk-hai before breathing his last breath. It's played like a devastating loss for the fellowship, but on Saruman's side they had to have been realizing that if that kill ratio kept up, the orcs and goblin-men were going to need to step up the fuckin'.
Which, to be fair, they totally did.
But OK, there were only a few Uruk-hai in that scene, and maybe they were tired or something. So in The Two Towers, the real Uruk-hai army shows up, 10,000 of them at the Battle of Helm's Deep ...
"So, um ... is there, like, a plan? We aren't just going to charge right into their arrows, are we? Guys?"
At which point rows and rows of them are mowed down by a tiny, ragtag group of random untrained dudes the good guys pulled off their farms. The massive, overwhelming force of specially bred soldier-monsters is held at bay for hours before they resort to suicide bombing the fortress. This works briefly before reinforcements show up for the good guys -- reinforcements of regular soldiers, not specially bred super-soldiers -- at which point the Uruk-hai flee for their lives and are punched to death by trees.
Trees on Thorazine.