The big problem with chihuahuas is that most people encounter the badly bred ones... the ones from pet stores, BYBs, etc, etc.
Not only are they badly bred, they are also purchased by people who treat them like children... so they are set up for disaster from the get go.
You hardly ever see well bred chihuahuas around here. I actually ran into Tucker's 1/2 brother at the park because he was a perfect looking chi. lol. I asked his owner where he came from, and it turns out they share fathers.