More importantly, I seriously truly hope that those of you who have varied experiences, especially regarding the mandatory TE's kotoutumiskurssi, would give honest feedback to those teachers and other people involved in planning those courses, as well.
And if feeling daring, even to the TE worker that you deal with. (Proceed with caution

They don't need the Yes Mens adoring feedback every time, but rather feedback regarding these well analyzed troubling spots, the too-slowness, the overwhelming speed or odd structure. That's the only way that they can ever improve it (if they have the will..), especially if a lot of people drop out. And at least the constructive feedback would give them something to think about why some people struggle or why some drop out.
Indeed, for many the courses that are slightly more advanced than one's current level, are usually better for them than the too slow ones. You'll lose interest very quickly, if forced to go to the slow basic TrueBeginners' course, when you might already know a bit and they keep droning on an on about the ABCs and lists like minun kirjani, sinun kirjasi, hänen kirjansa, for several days on end.

Quote from a friend: "Goddammit, there really is a book, all day long, and it is usually never my book. I get it!! *rips hair out* "
Don't be afraid to give feedback, during the course or after it. Even straight to the teachers but especially if you get a chance to write it out, so they can go through it carefully.
If people seem to be following the teaching, they might not have a clue that it is too much too fast, or why someone is looking a bit baffled or bored - might just write them down as unmotivated or lazy, and doesn't do any good to anyone.
As for the slower speed learning; yes indeed, would be great to find the ideal pace for everyone. No shame in slower learning either. Hey, we even have a saying here: "Hiljaa hyvä tulee."
Onnea matkaan, jatkakaa samaan malliin!