They can have hip dysplasia, among other health issues, which is why it's important to go to a good breeder who knows what they are doing. German Shepherds are good dogs though when properly bred and raised. See my avatar :)
Quoting: Laura Bow ^that's what its called!
I love your AV, okay I am getting excited again.
I just want to make sure I make the right decision. Its been years since my last dog passed away and I feel like I can love another dog again.
Quoting: mk ultra 5813027 A poem and best wishes to you and your future friend. Wishing you many years of companionship, respect, and love.

The stately German Shepherd-
Protective, bold and smart,
Looked into my eyes one day
And quickly stole my heart.
Courageous and endearing,
A favorite of its breed,
So proud and yet so loving,
A steadfast friend indeed.
Caring disposition,
Faithful to the core-
If you have a Shepherd’s love,
You cannot want for more.
- Author Unknown