Thoth is my main and probably favorite deck. It's brutally honest. Brutally honest people are not always the easiest to get along with but sometimes you need them. And they are irreplaceable when you need to know the truth.
Like every other serious deck, Thoth can be used in a never-ending waltz of "intuition only" - "background learning" - "integration of both" - and on we go with intuition-learning-integration... It never ends.
There are no easy or difficult decks (just as IMO there are no "good" or "bad" cards). If you want to have hones answers to tough questions, even a deck that looks shallow or decorative may become a tool for serious insight. And if you treat a "difficult" deck as messenger of good news only (like a friend of mine who insists on opening again and again over the same question, until she "gets an answer" she likes...), all you get is muddled messages mixed with wishful thinking.
I'm not a fan of the deck's creator but feel it is also infused with the artist's energy which is much lighter and warmer. Besides, the energies around a deck are influenced also by those who wrote the books or websites you use for getting to know it better, and most important: by your own story with a deck.
IMO, Gestalt principles are true again. The relationship between yourself and a specific deck is always more than 1+1, just like the relationship of two people is more than each partner was before.
So it really depends on you, too, how the deck will work.