So are Greek Orthodox and Russian Orthodox more or less the same?

I noticed that they were clubbed together in the chart that Ramil linked to.
I thought the chard was pretty good although I am only aware of the main differences between protestants and catholics. The rest is pretty much unknown to me...

When I go to church here in the UK, I go to a Baptist church, mainly because I know some people there, it's really close to my house and the minister is very good. I haven't noticed anything that's different from Lutheranism, other than less emphasis on formality and lithurgy.

A question for the Orthodox Christians here:
Do you think that the Russian Orthodox church lost some of it's credibility during the Soviet era, or do you think that it's stayed true to it's creed?

I read a comment on a news paper article were someone were saying that the Russian state and the Church are now TOO close, instead of the opposite way around earlier. The comment was claiming that the church is getting more influence and money than it deserves, and that it is in cohorts with the United Russia party. Is this a common opinion? (That doesn't seem very shocking to me, coming from a country that has a "state church" there are some benefits with this system as long as it is not abused.)