I will probably read the books one day. I haven't read any yet. Will watching the series before reading the books spoil the fun I wonder. I have been lucky to have read the books before watching the screen adaptations of almost all screen adaptations I have seen so far.
Anyway from the description you give about Littlefinger from the books he sounds as secretive as he should be. In the TV series it is obvious that he is a disloyal opportunist and his intentions are written all over his face. Of course one cannot read his mind but it is obvious that he is an untrustworthy opportunist. I look forward to reading the chapter you recommended if I ever start reading the books.
Could it be that the actor is bad or was he doing what he is asked or has he not read the books I wonder.