This is actually one of the strong suits of Playmaker: There aren't many tutorials because you simply don't need them. Lots of actions do the same thing as a certain function/line of code in normal programming, so if you want to create a certain thing with playmaker, you just need to google something like "Unity XXX" and then follow a scripting tutorial with playmaker.
Now, I know you're probably saying this is stupid and that I as a programmer am biased since I can read code and stuff, but I can assure you that reading code and actually writing it are 2 entirely different things. Reading code is almost like reading English
Look for a topic that interests you and post a good/goodlooking tutorial from a coding blog or whatever in this thread. I'll show you how it works on that example then.
Plus, you may have noticed that any specific question generally gets a nifty answer here on the forums within a day or so
So the lack of tutorials really shouldn't be too hard on anyone determined.