The series is excellent. It has become very tech-heavy over the last couple of books, but the characters are generally interesting and the plot is still intriguing to keep me interested. All in all quite enjoyable.
I've read the first book now, and it was as you say, quite enjoyable.
I'm really struggling with the second book though. I don't mind the threat of going mad trope when it's done right, but it isn't very good in Tarrin Kael. Rather than making my sympathize with him, he's making me actively dislike him. His version of madness is that he's easy to use violence and other than that he spends his time sulking about how no one in the world understands him. Rather than some madness, he's more like a violent child.
How long does this "emo-phase" last if you don't mind me asking? No need for spoilers of what happens, I just want to know if he stops acting like a man-child anytime soon, because if he won't, I don't think I can force myself through all five books.