Hello Fedor,
I didn't really like any of the Published novels too much either due to the fact that they were written/geared for a more juvenile audience. It's not the authors' fault. They are very good authors. It was a miscalculation by Lucas. The man's a genius, but even geniuses make mistakes.
I'll tell you what, after you read through the Published Indiana Jones novels, go to the fan fiction page here and read mine. It's not finished yet, but it's the first of several that I have planned. I'm trying to keep to the feel of what an Indiana Jones story should be, while presenting it in a little bit more mature style, with the accent on adventure and intrigue and less emphasis on the supernatural.
Then again it might suck. But give it a try.
Monkey apologizes to all for the shameless self promotion in this post, but I don't have an agent