"Ari jaaksi: Symbian was a religion inside Nokia"

Exactly: All Nokia Employees believed in a religion called Symbian. When they got home from work they would bow down before the Symbian god and give thanks for their daily bread.
And him leaving Nokia in no way was him trying to get more money for doing the same or less work and taking advantage of what he learned from his juniors working on meego or symbian.

"According to him year ago MeeGo was in a very bad shape inside the company."

Yes meego was in such bad shape. For a brand new operating system it should just sweep past all other operating systems very quickly even faster than Andriod. I mean come on people! snap and pop,..... snap and pop.

"Organisation build around MeeGo back then was made impossible to work in that I could not see how I was able to do my job. – Jaaksi"

You see, he could not see how he could do his job!
Therefore it is the groups fault and they are Symbian religious and he is completely justified in accepting a big check from another company to work elsewhere.

"HP wanted me in every way possible more than Nokia and i’m not just talking about my paycheck. – Jaaksi"

HP wanted him people,.... In every way! More than Nokia. And he's not just talking about his paycheck, no way! What's a paycheck?

"He says that Nokia made huge mistake by not going after MeeGo earlier and more seriously. Something i’m sure every other people thinks as well, especially after seeing that Swipe UI."

And he's not just saying that after the fact because everyone else on the internet is saying that. He is saying this now because he feels compelled to say how much he likes meego even though he left for another company with another OS.
He never saw the swipe UI before all of us did and it was impossible for him to do his job even though he was head of maemo/meego.

"Biggest worry inside Nokia was not how good Maemo 5/N900 was or how much it could sell, but how it would affect Symbian. – Jaaksi"
Yes people he is right on this one because everybody knows that all the employees beneath him were completely unaware that a device can boot more than one OS so it ALWAYS HAS TO BE THIS OS OR THAT OS, choose because you can't have both. It can't be 2 at once. Therefore all symbian employees underneath him that liked symbian were anti maemo and vice versa.