I was quite turned off by the constant shift-holding to see additional info, the tiny script in which it is depicted and the many many - mostly unexplained - numbers that the game shows for spell components. The game is very unhelpful in introducing almost anything about the system. I also feel like the way in which the information is somewhat messily portrayed as a mix of text and numbers in a way where each bit of info is not clearly delimited, is also a problem.
However, not paying too much attention to all the numbers and focusing more on functionality has helped me enjoy it more. As Chris points out, some of the Sigils that get introduced after a while also make things more interesting. I have only played a few hours and I'm currently messing around with Delirium and Corruption (on top of Fire), which is quite interesting.