Pay is shit. I have friends who make more in all other countries of Europe (Austria, Germany, Poland) and that's not even considering the costs of living (that is inferior to Paris).
You will have huge trouble because you don't speak French.
You will have huge trouble for all administrative stuff. Like, it's hell to rent a flat even if you could pay 12 months in advance, because there isn't any AND the agencies will reject you because you don't have a history in France nor French parents with income to "vouch" for you.
Most importantly. There are no good jobs. The startup ecosystem is a joke and there is no Google/Facebook/Apple/Uber/AirBnb to work for.
And finally, the quality of living is mediocre, at best.
1. You are mostly right, but you are also exaggerating : in Poland you barely make half of what you get in Paris. (But the cost of living is also way inferior)
2. that's absolutely right, but working in Germany without speaking German wasn't really a good experience of mine either.
3. that's cute. Administrations are horrible everywhere, and it's even worst if it's not your country because you don't know what “everybody knows”.
4. Google is in Paris, but if you're looking for a good job, you probably don't want to work for Google anyways. (At least I don't, since I've had several bad feedbacks from both French or American offices)
5. this is highly subjective, I won't argue over this one.
1. My polish friends's payslips say "nope". [Though there is a big variance on polish salaries from lower to higher.]
2. Just meant to better consider staying or going to a country one speaks the language. No European countries speak or learn french, too badd ^^
3. There are variable levels of challenge. Some of which can be now circumvented with airbnb :D
4. Google ain't -really- in Paris. The first thing that comes up in the interview for frenchies is "that position only exists in Zurich or Dublin or London, do you have a preference?".
I relocated from Paris to SF as a senior dev, and I am going back after 1 year. Yes I was making like 3x more in salary, but then housing in SF cost at least 2x more than in Paris, commute is just as bad, healthcare is a mess etc. And taxes are not that low :) - lower than in France, but you do not get much back, ie no healthcare, no retirement, not very good infrastructures etc. For me overall financially it is more interesting to go back.
Regarding jobs, I never had any problems to find interesting jobs in Paris, but I am working in embedded/low-level/networking/telcos systems, and I think Europe is skewed towards this kind of stuff whereas SV is skewed towards web/mobile.
To be honest I think it really depends of your lifestyle and priorities. I really enjoyed my year in SF, it is a beautiful city with great peoples, but I'll be happy to get back to Paris.
Honestly, my best advice for youngsters would be to leave the country for a few years. That's just the best option on the long term. They can come back to France, if they ever want to, and their experience will [hopefully] allow them to get interviews in the very few decent Parisian places.
I'm in distributed large scale systems. Not much of those in Paris I'm afraid ^^