I live in Tel-Aviv. I was born in Israel so I can't tell you how easy it is, but I have many immigrant friends and it seemed easy for them, if you can prove Jewish ancestry. They also get some help package from the government (basically money every month for the first year or something, but you might have to return some of it if you leave quickly. You should check it out, anyway).
As for living here, there are pros and cons. If you tell people you emigrated from the US they will most likely gawk and say "what the fuck? Why?"
I can give more specific notes if you say where you're from and what do you do.
Pros, compared to the US:
- Health care and social services are better.
- In some specific fields there is more employment.
- No antisemitism if that's a concern for you.
- Safer (terrorism included).
Cons:
- High cost of living, especially rent and food costs.
- People are almost ubiquitously rude.
- Customer service is terrible.
- There's no public transport on Saturday and many stores close on Saturday, especially outside of tel aviv.
- If you can get EU citizenship, there are countries with the same pros and none of the cons.