As someone who's almost done with his Ph.D., I wouldn't recommend it. Although I did mine in the US. European universities are different in some ways (e.g., I've heard they don't require Ph.D.s to do TA work, which is nice).
I wouldn't say TA work is not required. It all depends where the funding for the position is coming from. If the university is funding it without any extra grants or cooperations, TA work is definitely a huge part of being a PhD-student.