Ok so I’ve read Gary’s comment about 30 times now, and no wonder you are confused.
It’s not very clear. I’m not sure if he works much with international clients?
It seems to me like he is saying that if a user, sitting in the united states searching on Google.com for a page in say for example French, using a native French search term that a site with French content will rank better than a site with “geographical targeting”
I will assume he is talking about the Set geographic target feature in Google Webmaster Tools.
There is a great video on this tool here http://www.youtube.com/watch?v=r9r3PayqaZM
And the quick way to set this is
Go to Google Webmasters>Choose your site>Click on Tools>Click on Set Geographic Target 
Here is the problem.
A) The fictional user in most cases does not exist. In the US even the French go to Google.fr, and when you use Google.fr a translated site is the best case.
You wouldn’t want to Geo_Target your site if you have the .fr, you would really only want to do this if you were using a config like this fr.elgoogrocks.com and you also had dk.elgoogrocks.com, and nl.elgoodrocks.com, or any other geo-specific locations under the elgoogrocks.com and you wanted those domaines to have a chance to rank.
I hope this helps?
Oh and to answer your actual question.
“Do I understand right that if I have the meta language tag on page (e.g. French) and in Googlewebmastertools country also set to France, it is worse than only the meta tag set?”
No, not really. It would be better to have the .fr tld, have the site hosted in France, and all in native French than to just have the geographic target set in webmastertools.
“And how about searches in the native language on google.fr or on the “web” in google.fr in the case both meta language and country are set?? “
Well again it would be better to have the site on .fr, and in French, and be hosted in France. But don’t forget on-page is only 10%, what you need to be focused on if you really want to rank and convert in France for French is being a bigger part of the conversation.
Get active in building links organically related to your topic in France, on French sites. Use your content to target specifically latent French and topic related terms.
There have many great French poker players such as Jac Arama, David Benyamine, Jan Boubli, Patrick Bruel, Bruno Fitoussi, Bertrand Grospellier, Tuan Le, Pascal “Triple P” Perrault, Vanessa Ashley Rousso, as well as Manuel Bevand.
Talk about them, where they play, famous moments, and awesome hands, see if you can get an interview.
At the end of the day living it, being part of the experience, taking part in the bigger conversation, contributing on a regular basis, that is the real secret behind SEO, it’s the meat of it all not the secret sauce that will help you rank well, and convert.