Well, on Puljujärvi's English, it's pretty difficult for me to relate personally even though I'm Finnish. I think the first 5 years or so of English classes all I did was ask the teacher some vocab questions every few classes and collect perfect marks - I learned pretty much all my English just by playing video games and watching movies or TV series. I imagine that's how it is for most people, at least to some extent.
Still, in general his English really is very bad. It's something I'd expect out of a 10-year-old whose only exposure to English would be in English classes of the Finnish school system. I think that even as a 9-year-old you learned to form more coherent sentences. It's very difficult for me to understand, even relating to how my classmates' English was when I was around 9-11 years old.
Unlike many countries, there rarely are Finnish dubs of movies and TV-series and video game interfaces for instance almost never are in Finnish. You tend to just learn naturally. For a Finnish person the general standard of English I'd expect is far greater than that of a Russian player or even German, French.