how does that make them interesting? Most of the Jews i know come back with renewed faith. One of my friends even tried meddling in his sister's affairs to make her stop clubbing. (He was in quite a strict yeshiva. And shes now in Tel Aviv, where... um, she enjoys the night life.)
I've met more than my fair share of israelis, mostly class and campmates. And friends who made aliyah (and joined Tzahal). and... um... shuri ulami girls. and teachers. Also, my sister is in Jerusalem right now. Shes at seminary for her year.